added interpreters_map.go generation

fixed Interpreters comment

internal/code-generator/assets/interpreters.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 -}}
+}