Set --parser option in Prettier's fixer (#1620)

* Set `--parser` option in Prettier's fixer
* Add expected `--parser` option to tests
* Disable Prettier `--parser` detection if file extension exists
* Manually default Prettier `--parser` to "babylon"
* Add `--parser` test for TypeScript
* Add tests for Prettier `--parser`
* Add JSON5 to the suggested fixer for Prettier

autoload/ale/fix/registry.vim

@@ -51,7 +51,7 @@ let s:default_registry = {
 \   },
 \   'prettier': {
 \       'function': 'ale#fixers#prettier#Fix',
-\       'suggested_filetypes': ['javascript', 'typescript', 'json', 'css', 'scss', 'less', 'markdown', 'graphql', 'vue'],
+\       'suggested_filetypes': ['javascript', 'typescript', 'css', 'less', 'scss', 'json', 'json5', 'graphql', 'markdown', 'vue'],
 \       'description': 'Apply prettier to a file.',
 \   },
 \   'prettier_eslint': {