Small change in naming of the pages

_data/navigation.yml

@@ -33,7 +33,7 @@ docs:
 
   - title: Development
     children:
-      - title: "Reporting a bug"
+      - title: "Reporting an issue"
         url: /docs/bug_report/
       - title: "Continuous integration"
         url: /docs/travis/

_pages/docs/bug_report.md

@@ -2,7 +2,7 @@
 layout: single
 title : "Documentation"
 author_profile: false
-excerpt: "Reporting a bug"
+excerpt: "Reporting an issue"
 header:
   overlay_color: "#C70039"
 permalink: /docs/bug_report/