CI: Enable revive linter (drop-in replacement of golint).

.golangci.yml

@@ -1,3 +1,34 @@
 linters:
   enable:
     - gofmt
+    - revive
+
+linters-settings:
+  revive:
+    ignoreGeneratedHeader: true
+    severity: warning
+    rules:
+      - name: blank-imports
+      - name: context-as-argument
+      - name: context-keys-type
+      - name: dot-imports
+      - name: error-return
+      - name: error-strings
+      - name: error-naming
+      - name: exported
+      - name: if-return
+      - name: increment-decrement
+      #- name: var-naming
+      - name: var-declaration
+      - name: package-comments
+      - name: range
+      - name: receiver-naming
+      - name: time-naming
+      - name: unexported-return
+      - name: indent-error-flow
+      - name: errorf
+      - name: empty-block
+      - name: superfluous-else
+      #- name: unused-parameter
+      - name: unreachable-code
+      - name: redefines-builtin-id