Issue title: Extension work using // stops
 Issue body: Sorry, I'm using Google Translator

Using // in the documenting comment / ** * / I get two exceptions:

> todo-tree: Invalid regular expression: /*//TODO/: Nothing to repeat
> Running the contributed command: 'todo-tree.refresh' failed.
```
Example:
/** 
* //TODO: Make custom downloads
* ! Exception handling fails
*/
```
 Comments: 
 Comment 0: Please post your `todo-tree.regex.regex` setting - I expect you need to escape some characters.
 Comment 1: ```((//|#|<!--|;|/\*|^)\s*($TAGS)|^\s*- \[ \])```
 Comment 2: That is the default regex. Have you made any other settings changes? If I put your example in my code it finds the TODO correctly.

Please can you set `todo-tree.general.debug` to `true` to then go to the output view. You should find "Todo Tree" in the drop down list. Please select it and copy the contents here.
 Comment 3: I added a record `* TODO: ` to the parameter `General: Tags`. But without this, errors still appear.
Here is the result you requested:
```
Searching d:\NodeJSProjects\VueCLI\folderProject...
Command: "c:\Users\WorkerSEE\AppData\Local\Programs\Microsoft VS Code\resources\app\node_modules.asar.unpacked\vscode-ripgrep\bin\rg.exe" --no-messages --vimgrep -H --column --line-number --color never --max-columns=1000 --no-config  -e "((//|#|<!--|;|/\*|^)\s*(TODO|FIXME|\* TODO)|^\s*- \[ \])" "d:\NodeJSProjects\VueCLI\folderProject"
 Match (Editor):{"file":"d:\\NodeJSProjects\\VueCLI\\folderProject\\src\\server\\routes\\photographerApi.js","line":170,"column":25,"match":"                        // TODO rea-media api key"}
d:\NodeJSProjects\VueCLI\folderProject\src\mixins\FirebaseMixins.js:241:1:                TODO: Описать объект

d:\NodeJSProjects\VueCLI\folderProject\src\template-component\test.vue:73:1:             * TODO: динамическое имя с названием объекта

d:\NodeJSProjects\VueCLI\folderProject\src\views\Objects.vue:454:24:                  <!-- // TODO: Добавить фильтр для изображений-->
d:\NodeJSProjects\VueCLI\folderProject\src\views\Objects.vue:810:1:// TODO: описать начальную инициализацию объекта
d:\NodeJSProjects\VueCLI\folderProject\src\views\Objects.vue:1983:12:         * // TODO: преобразовать массив объектов в массив с именами
d:\NodeJSProjects\VueCLI\folderProject\src\views\Objects.vue:1984:12:         * // TODO: динамическое имя с названием объекта
d:\NodeJSProjects\VueCLI\folderProject\src\views\Objects.vue:1985:12:         * // TODO: Спиннер при скачивании файлов
d:\NodeJSProjects\VueCLI\folderProject\src\views\Objects.vue:1986:12:         * // TODO: скачивание анкеты вместе с файлами
d:\NodeJSProjects\VueCLI\folderProject\src\views\Objects.vue:1987:12:         * // TODO: скачивание документов по отдельности
d:\NodeJSProjects\VueCLI\folderProject\src\views\Objects.vue:1988:1:         * TODO: если скачивают один через панель

d:\NodeJSProjects\VueCLI\folderProject\src\server\routes\photographerApi.js:170:25:                        // TODO photographer api key

 Match (File): {"file":"d:\\NodeJSProjects\\VueCLI\\folderProject\\src\\mixins\\FirebaseMixins.js","line":"241","column":"1","match":"                TODO: Описать объект"}
 Match (File): {"file":"d:\\NodeJSProjects\\VueCLI\\folderProject\\src\\template-component\\test.vue","line":"73","column":"1","match":"             * TODO: динамическое имя с названием объекта"}
 Match (File): {"file":"d:\\NodeJSProjects\\VueCLI\\folderProject\\src\\views\\Objects.vue","line":"454","column":"24","match":"                  <!-- // TODO: Добавить фильтр для изображений-->"}
 Match (File): {"file":"d:\\NodeJSProjects\\VueCLI\\folderProject\\src\\views\\Objects.vue","line":"810","column":"1","match":"// TODO: описать начальную инициализацию объекта"}
 Match (File): {"file":"d:\\NodeJSProjects\\VueCLI\\folderProject\\src\\views\\Objects.vue","line":"1983","column":"12","match":"         * // TODO: преобразовать массив объектов в массив с именами"}
 Match (File): {"file":"d:\\NodeJSProjects\\VueCLI\\folderProject\\src\\views\\Objects.vue","line":"1984","column":"12","match":"         * // TODO: динамическое имя с названием объекта"}
 Match (File): {"file":"d:\\NodeJSProjects\\VueCLI\\folderProject\\src\\views\\Objects.vue","line":"1985","column":"12","match":"         * // TODO: Спиннер при скачивании файлов"}
 Match (File): {"file":"d:\\NodeJSProjects\\VueCLI\\folderProject\\src\\views\\Objects.vue","line":"1986","column":"12","match":"         * // TODO: скачивание анкеты вместе с файлами"}
 Match (File): {"file":"d:\\NodeJSProjects\\VueCLI\\folderProject\\src\\views\\Objects.vue","line":"1987","column":"12","match":"         * // TODO: скачивание документов по отдельности"}
 Match (File): {"file":"d:\\NodeJSProjects\\VueCLI\\folderProject\\src\\views\\Objects.vue","line":"1988","column":"1","match":"         * TODO: если скачивают один через панель"}
 Match (File): {"file":"d:\\NodeJSProjects\\VueCLI\\folderProject\\src\\server\\routes\\photographerApi.js","line":"170","column":"25","match":"                        // TODO rea-media api key"}
Found 12 items
Found 12 items
```
_p.s. Sorry, comments are written in Russian_
 Comment 4: Hi - are you still having problems with this? I have tried adding `* TODO` as a tag and it works as expect for me.

What errors are you seeing?
 Comment 5: I'm going to close this - please feel free to reopen it if you can give me any further information. 
 Comment 6: The extension used to work well, but now it doesn't. I get this error message. Running the contributed command: 'todo-tree.refresh' failed.
 Comment 7: What version of vscode are you using?
 Comment 8: ![Screenshot_3](https://user-images.githubusercontent.com/29357907/82152569-d70b0380-986a-11ea-8b24-c5d09195f4a2.png)

 Comment 9: Your version is quite out of date. The version of the extension is not compatible - you'll either need to update vscode or revert to an earlier version of the extension. Sorry - I need to put it a dependency check.
 Comment 10: Thanks!
{'source': 'GithubIssues', 'repo_name_with_owner': 'Gruntfuggly/todo-tree', 'issue_id': 529853448, 'repo_stars': 994.0}