Fix graphql-ast link

README.md

@@ -4,7 +4,6 @@
 
 <p align="center">
     <a href="https://travis-ci.org/railt/lexer"><img src="https://travis-ci.org/railt/lexer.svg?branch=master" alt="Travis CI" /></a>
-    <a href="https://scrutinizer-ci.com/g/railt/lexer/?branch=master"><img src="https://scrutinizer-ci.com/g/railt/lexer/badges/coverage.png?b=master" alt="Code coverage" /></a>
     <a href="https://scrutinizer-ci.com/g/railt/lexer/?branch=master"><img src="https://scrutinizer-ci.com/g/railt/lexer/badges/quality-score.png?b=master" alt="Scrutinizer CI" /></a>
     <a href="https://packagist.org/packages/railt/lexer"><img src="https://poser.pugx.org/railt/lexer/version" alt="Latest Stable Version"></a>
     <a href="https://packagist.org/packages/railt/lexer"><img src="https://poser.pugx.org/railt/lexer/v/unstable" alt="Latest Unstable Version"></a>
@@ -16,10 +15,6 @@
 > Note: All questions and issues please send 
 to [https://github.com/railt/railt/issues](https://github.com/railt/railt/issues)
 
-> Note: Tests can not always pass correctly. This may be due to the inaccessibility of 
-PPA servers for updating gcc and g++. The lexertl build requires the support of a modern 
-compiler inside Travis CI. In this case, a gray badge will be displayed with the message "Build Error".
-
 In order to quickly understand how it works - just write ~4 lines of code:
 
 ```php