update ruby compat version from 2.1.0 to 2.2.0 [ci skip]

Author: chuckremes

configure

@@ -162,7 +162,7 @@ class Configure
     @vendored_libdir = File.join(root, "/vendor")
 
     # Ruby compatibility version
-    @ruby_version = "2.1.0"
+    @ruby_version = "2.2.0"
     @ruby_libversion = @ruby_version.split(/\./)[0..1].join.to_i
 
     # Configure settings