Speed up CI builds by reducing the build matrix

Author: lgeiger

.travis.yml

@@ -16,9 +16,8 @@ os:
 env:
   matrix:
     - NODE_VERSION="6" DEPLOY="true"
-    - NODE_VERSION="5" ELECTRON="0.37.8"
     - NODE_VERSION="6" ELECTRON="1.1.3"
-    - NODE_VERSION="6" ELECTRON="1.4.3" REBUILD="true"
+    - NODE_VERSION="6" ELECTRON="1.4.4" REBUILD="true"
   global:
     - GH_REF: github.com/nteract/zmq-prebuilt.git
     - secure: 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

appveyor.yml

@@ -4,12 +4,8 @@ environment:
   matrix:
     - nodejs_version: "4"
       deploy: "true"
-    - nodejs_version: "5"
-      electron: "0.37.8"
     - nodejs_version: "6"
-      electron: "1.1.3"
-    - nodejs_version: "6"
-      electron: "1.4.3"
+      electron: "1.4.4"
 
 platform:
   - x64