Add options to configure which language categories to display (#477)

source/plugins/languages/tests.yml

@@ -11,7 +11,6 @@
     plugin_languages: yes
     plugin_languages_ignored: html, css, dockerfile
 
-
 - name: Language plugin (skipped repositories)
   uses: lowlighter/metrics@latest
   with:
@@ -40,6 +39,13 @@
     plugin_languages: yes
     plugin_languages_threshold: 2%
 
+- name: Language plugin (with categories)
+  uses: lowlighter/metrics@latest
+  with:
+    token: MOCKED_TOKEN
+    plugin_languages: yes
+    plugin_languages_categories: programming, data
+
 - name: Language plugin (complete)
   uses: lowlighter/metrics@latest
   with:
@@ -50,3 +56,4 @@
     plugin_languages_colors: rainbow
     plugin_languages_details: bytes-size, percentage
     plugin_languages_threshold: 2%
+    plugin_languages_categories: programming, markup, data