bump RUBY_VERSION to 2.2.2, rack 2.0.0.alpha requires ruby >= 2.2.2

tak1n · tak1n · commit 991206b30220 · 2016-01-25T12:40:48.000+01:00
diff --git a/configure b/configure
@@ -163,7 +163,7 @@ class Configure
     @vendored_libdir = File.join(root, "/vendor")
 
     # Ruby compatibility version
-    @ruby_version = "2.2.0"
+    @ruby_version = "2.2.2"
     @ruby_libversion = @ruby_version.split(/\./)[0..1].join.to_i
 
     # Configure settings
