:construction_worker: ignore gh-pages branch in CircleCI

.circleci/config.yml

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 91ceaf7..b39f06a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -45,4 +45,10 @@
   build_and_test_all:
     jobs:
       - build_stable
+          branches:
+            ignore:
+              gh-pages
       - build_bleeding_edge
+          branches:
+            ignore:
+              gh-pages