Remove roave/security-advisories due to stability requirement

See #10

Author: sirbrillig

README.md

@@ -38,21 +38,6 @@ You can then include the sniffs by adding a line like the following to [your php
 
 It should just work after that!
 
-#### Troubleshooting
-
-If you see an error like this when trying to install the library, you will need to include stability information in your composer.json.
-
-```
-- sirbrillig/phpcs-variable-analysis dev-master requires roave/security-advisories dev-master -> satisfiable by roave/security-advisories[dev-master] but these conflict with your requirements or minimum-stability.
-```
-
-To fix this, add the following lines to your composer.json file and then try installing again.
-
-```
-"minimum-stability": "dev",
-"prefer-stable": true,
-```
-
 ### Standalone
 
 1. Install PHP_CodeSniffer by following its [installation instructions](https://github.com/squizlabs/PHP_CodeSniffer#installation) (via Composer, Phar file, PEAR, or Git checkout).

composer.json

@@ -21,7 +21,6 @@
     "prefer-stable": true,
     "require" : {
         "php" : ">=5.4.0",
-        "squizlabs/php_codesniffer" : "^3.0.2",
-        "roave/security-advisories": "dev-master"
+        "squizlabs/php_codesniffer" : "^3.0.2"
     }
 }