Update CodeClimate config

Author: sbstjn

.codeclimate.yml

@@ -6,6 +6,31 @@ plugins:
     enabled: true
   govet:
     enabled: true
+checks:
+  argument-count:
+    config:
+      threshold: 4
+  complex-logic:
+    config:
+      threshold: 4
+  file-lines:
+    config:
+      threshold: 500
+  method-complexity:
+    config:
+      threshold: 20
+  method-count:
+    config:
+      threshold: 20
+  method-lines:
+    config:
+      threshold: 50
+  nested-control-flow:
+    config:
+      threshold: 4
+  return-statements:
+    config:
+      threshold: 4
 exclude_patterns:
   - ".circleci"
   - ".git"