Update dependencies and add linting configuration

.golangci.yml

@@ -0,0 +1,61 @@
+version: "2"
+linters:
+  default: none
+  enable:
+    - bodyclose
+    - gocritic
+    - govet
+    - ineffassign
+    - staticcheck
+    - testifylint
+    - unused
+  settings:
+    govet:
+      disable:
+        - fieldalignment
+      enable-all: true
+  exclusions:
+    generated: lax
+    presets:
+      - comments
+      - common-false-positives
+      - legacy
+      - std-error-handling
+    rules:
+      - linters:
+          - bodyclose
+        path: .*_test.go
+      - linters:
+          - bodyclose
+        path: router/timeout_response.go
+      # False positives on CGO generated code
+      - linters:
+          - staticcheck
+        path: vips/.*
+        text: 'SA4000:'
+      # False positives on CGO generated code
+      - linters:
+          - gocritic
+        path: vips/.*
+        text: dupSubExpr
+      # False positives on CGO generated code
+      - linters:
+          - staticcheck
+        text: 'ST1005:'
+    paths:
+      - .tmp
+      - vendor
+      - third_party$
+      - builtin$
+      - examples$
+formatters:
+  enable:
+    - goimports
+  exclusions:
+    generated: lax
+    paths:
+      - .tmp
+      - vendor
+      - third_party$
+      - builtin$
+      - examples$