Stricter linting (#113)

.golangci.yml

@@ -0,0 +1,26 @@
+linters:
+  enable:
+    - bodyclose
+    - deadcode
+    - depguard
+    - errcheck
+    - goimports
+    - gosimple
+    - govet
+    - ineffassign
+    - misspell
+    - nakedret
+    - staticcheck
+    - structcheck
+    - typecheck
+    - unconvert
+    - unparam
+    - unused
+    - varcheck
+    - whitespace
+
+linters-settings:
+  goimports:
+    local-prefixes: github.com/amacneil/dbmate
+  misspell:
+    locale: US