Move gofmt from linters to formatters in config

The gofmt tool was removed from the linters section and added to the formatters section in .golangci.yml to properly configure its usage.

Author: jferrl

.golangci.yml

@@ -7,7 +7,6 @@ linters:
   enable:
     - unconvert
     - goconst
-    - gofmt
     - misspell
     - unparam
     - nakedret
@@ -19,3 +18,7 @@ linters:
     revive:
       rules:
         - name: redundant-build-tag
+
+formatters:
+  enable:
+    - gofmt