added interpreters_map.go generation

fixed Interpreters comment

internal/code-generator/generator/test_files/interpreters.gold

@@ -0,0 +1,16 @@
+package slinguist
+
+// CODE GENERATED AUTOMATICALLY WITH github.com/src-d/simple-linguist/cli/slinguist-generate
+// THIS FILE SHOULD NOT BE EDITED BY HAND
+// Extracted from github/linguist commit: fe8b44ab8a225b1ffa75b983b916ea22fee5b6f7
+
+var languagesByInterpreter = map[string][]string{
+	"bash":    {"Shell"},
+	"nush":    {"Nu"},
+	"python":  {"Python"},
+	"python2": {"Python"},
+	"python3": {"Python"},
+	"rc":      {"Shell"},
+	"sh":      {"Shell"},
+	"zsh":     {"Shell"},
+}

internal/code-generator/generator/test_files/interpreters.test.go.tmpl

@@ -0,0 +1,11 @@
+package slinguist
+
+// CODE GENERATED AUTOMATICALLY WITH github.com/src-d/simple-linguist/cli/slinguist-generate
+// THIS FILE SHOULD NOT BE EDITED BY HAND
+// Extracted from github/linguist commit: {{ getCommit }}
+
+var languagesByInterpreter = map[string][]string{
+	{{range $interpreter, $languages := . -}}
+	"{{ $interpreter }}":	{ {{- $languages | formatStringSlice -}} },
+	{{end -}}
+}

internal/code-generator/generator/test_files/interpreters.test.yml

@@ -0,0 +1,15 @@
+---
+Nu:
+  interpreters:
+  - nush
+Shell:
+  interpreters:
+  - bash
+  - rc
+  - sh
+  - zsh
+Python:
+  interpreters:
+  - python
+  - python2
+  - python3