Migrate config file of golangci-lint.

.golangci.yml

@@ -1,34 +1,52 @@
+version: "2"
 linters:
   enable:
-    - gofmt
     - revive
-
-linters-settings:
-  revive:
-    ignore-generated-header: 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
+  settings:
+    revive:
+      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
+  exclusions:
+    generated: lax
+    presets:
+      - comments
+      - common-false-positives
+      - legacy
+      - std-error-handling
+    paths:
+      - third_party$
+      - builtin$
+      - examples$
+formatters:
+  enable:
+    - gofmt
+  exclusions:
+    generated: lax
+    paths:
+      - third_party$
+      - builtin$
+      - examples$