chore: change default branch to main.

.gitlab-ci.yml

@@ -77,7 +77,7 @@ pages:
     paths:
       - public
   only:
-    - master
+    - main
 
 git_ops:
   image: elixir:latest
@@ -86,7 +86,7 @@ git_ops:
   stage: release
   only:
     refs:
-      - master
+      - main
   except:
     variables:
       - $CI_COMMIT_MESSAGE =~ /chore\:\ release version/

README.md

@@ -1,5 +1,5 @@
 # Heap
-[![Build Status](https://travis-ci.org/jamesotron/heap.svg?branch=master)](https://travis-ci.org/jamesotron/heap)
+[![Build Status](https://travis-ci.org/jamesotron/heap.svg?branch=main)](https://travis-ci.org/jamesotron/heap)
 [![Hex.pm](https://img.shields.io/hexpm/v/heap.svg)](https://hex.pm/packages/heap)
 [![Inline docs](http://inch-ci.org/github/jamesotron/heap.svg)](http://inch-ci.org/github/jamesotron/heap)