chore(docs): remove leading dollar sign

README.md

@@ -288,7 +288,7 @@ This project follows [SemVer](https://semver.org/).
 This will install the latest supported version:
 
 ```bash
-$ composer require react/promise-timer:^1.9
+composer require react/promise-timer:^1.9
 ```
 
 See also the [CHANGELOG](CHANGELOG.md) for details about version upgrades.
@@ -304,13 +304,13 @@ To run the test suite, you first need to clone this repo and then install all
 dependencies [through Composer](https://getcomposer.org/):
 
 ```bash
-$ composer install
+composer install
 ```
 
 To run the test suite, go to the project root and run:
 
 ```bash
-$ vendor/bin/phpunit
+vendor/bin/phpunit
 ```
 
 ## License