Drop interfacer and goconst from golangci-lint config (#118)

.golangci.yml

@@ -3,9 +3,6 @@ run:
   modules-download-mode: readonly
 
 linters-settings:
-  goconst:
-    min-len: 2
-    min-occurrences: 2
   gofmt:
     simplify: true
   goimports:
@@ -24,7 +21,6 @@ linters:
     - bodyclose
     - deadcode
     - errcheck
-    - goconst
     - gocritic
     - gofmt
     - goimports
@@ -33,7 +29,6 @@ linters:
     - gosimple
     - govet
     - ineffassign
-    - interfacer
     - misspell
     - nakedret
     - staticcheck
@@ -58,5 +53,4 @@ issues:
     - path: _test\.go
       linters:
         - bodyclose
-        - goconst
         - scopelint # https://github.com/kyoh86/scopelint/issues/4