adjust cognitive complexity threshold to 6 for codeclimate

.codeclimate.yaml

@@ -0,0 +1,32 @@
+version: "2"         # required to adjust maintainability checks
+checks:
+  argument-count:
+    config:
+      threshold: 4
+  complex-logic:
+    config:
+      threshold: 4
+  file-lines:
+    config:
+      threshold: 300
+  method-complexity:
+    config:
+      threshold: 6
+  method-count:
+    config:
+      threshold: 20
+  method-lines:
+    config:
+      threshold: 25
+  nested-control-flow:
+    config:
+      threshold: 4
+  return-statements:
+    config:
+      threshold: 4
+  similar-code:
+    config:
+      threshold: # language-specific defaults. an override will affect all languages.
+  identical-code:
+    config:
+      threshold: # language-specific defaults. an override will affect all languages.