Issue title: styled-components v5: flow types themselves fail flow lint
 Issue body: **Do you want to request a *feature* or report a *bug*?**
Bug in styled-components v5 flow types.

**What is the current behavior?**
Latest styled-components flow types produce a flow error.

To reproduce, just install latest flow, pull down the latest `styled-components` flow types, and run flow.

This error will result:

```
Error ┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈ flow-typed/npm/styled-components_v5.x.x.js:416:39

Missing type annotation for V. V is a type parameter declared in function type [1] and was implicitly instantiated at
$ObjMap [2].

     413│     ElementName
     414│   >;
     415│
 [2] 416│   declare type ConvenientShorthands = $ObjMap<
     417│     BuiltinElementInstances,
 [1] 418│     <V>(V) => StyledShorthandFactory<V>
     419│   >;
     420│
     421│   declare interface Styled {
     422│     <Comp: React$ComponentType<P>, Theme, OwnProps = React$ElementConfig<Comp>>(
```

**What is the expected behavior?**
Flow type should be valid

**Local Environment Information**
Flow v. 0.123.0 (also reproduces on at least 0.122.0, haven't tried on others), latest `styled-components` v5 flow types.

 Comments: 
 Comment 0: cc @omninonsense 
 Comment 1: Hi @walkerdb!

I'm aware of this issue, but I'm not sure how to fix it. I'm not even sure if it's a bug with the libdef or something in Flow. 

But, generally, it happens when people forget to call one of the shorthands, e.g:

```js
// Error
const C = styled.div
```

vs 

```js
// Fine
const C = styled.div``
```

Someone made a stripped down version of the libdef that reproduces the error and they've opened an issue Flow (facebook/flow#8344)
 Comment 2: I'm upgrading from an old flow version (`v0.79.1`), it took me a while to figure out what was going on. Found out this is causing me issues:
```js
// $FlowFixMe[missing-annot] Upgrade Flow to v0.129.0.
export const MyDiv = styled.div``;
```
It correctly suppresses the error in the file but bubbles it up to the `styled-components` libdef. This doesn't seem like a libdef issue, but rather a flow issue.
{'source': 'GithubIssues', 'repo_name_with_owner': 'flow-typed/flow-typed', 'issue_id': 604514867, 'repo_stars': 1410.0}