Merge pull request #60 from dev-sec/mysql_version

fix mysql_version command

Author: micheelengronne

libraries/mysql_version.rb

@@ -27,6 +27,6 @@ def initialize(user, pass)
   end
 
   def mysql_version
-    inspec.command("mysql -sN -e 'SHOW VARIABLES WHERE variable_name = \"version\"'").stdout.strip.split("\t")[1].to_s
+    inspec.command("mysql -sN -e 'SHOW VARIABLES WHERE variable_name = \"version\"'").stdout.strip.split('\t')[1].split('-')[0].to_s
   end
 end