message: Fix PHP extension support section in README
diff: @@ -117,7 +117,7 @@ On all supported OS/Platforms the following PHP versions are supported as per th
  PHP extensions can be setup using the `extensions` input. It accepts a `string` in csv-format.
  -- On `Ubuntu`, extensions which are available as a package, available on `PECL`, or hosted on GitHub can be setup.
  +- On `Ubuntu`, extensions which are available as a package, available on `PECL` or a git repository can be set up.
  ```yaml
  - name: Setup PHP with PECL extension
  @@ -129,7 +129,9 @@ PHP extensions can be setup using the `extensions` input. It accepts a `string`
  - On `Windows`, extensions available on `PECL` which have the `DLL` binary can be set up.
  -- On `macOS`, extensions available on `PECL` or hosted on GitHub can be installed.
  +- On `macOS`, extensions available on `PECL` or a git repository can be set up.
  +
  +- On `Ubuntu` and `macOS` to compile and install an extension from a git repository follow this [guide](https://github.com/shivammathur/setup-php/wiki/Add-extension-from-source "Guide to compile and install PHP extensions in setup-php").
  - Extensions installed along with PHP if specified are enabled.
  @@ -178,7 +180,7 @@ PHP extensions can be setup using the `extensions` input. It accepts a `string`
  - These extensions have custom support:
  - `cubrid`, `pdo_cubrid` and `gearman` on `Ubuntu`.
  - `geos` on `Ubuntu` and `macOS`.
  - - `blackfire`, `couchbase`, `ioncube`, `oci8`, `pdo_oci`, `pecl_http`, `phalcon3` and `phalcon4` on all supported OS.
  + - `blackfire`, `couchbase`, `ioncube`, `oci8`, `pdo_firebird`, `pdo_oci`, `pecl_http`, `phalcon3` and `phalcon4` on all supported OS.
  - By default, extensions which cannot be added or removed gracefully leave an error message in the logs, the action is not interrupted. To change this behaviour you can set `fail-fast` flag to `true`.
  @@ -192,8 +194,6 @@ PHP extensions can be setup using the `extensions` input. It accepts a `string`
  fail-fast: true
  ```
  -- On `Ubuntu` and `macOS` extensions can be compiled and installed from source by suffixing the extension's name with `repository@version`. Follow this [guide](https://github.com/shivammathur/setup-php/wiki/Add-extension-from-source "Guide to compile and install PHP extensions in setup-php") for more details and examples.
  -
  ## :wrench: Tools Support
  These tools can be setup globally using the `tools` input. It accepts a string in csv-format.
  