refactor(ci): use develop branch over staging

Author: jaredcnance

.travis.yml

@@ -10,6 +10,6 @@ dotnet: 1.0.0-preview2-1-003177
 branches:
   only:
     - master
-    - staging
+    - develop
 script:
   - ./build.sh

appveyor.yml

@@ -4,7 +4,7 @@ pull_requests:
 branches:
   only:
   - master
-  - staging
+  - develop
 nuget:
   disable_publish_on_pr: true
 build_script:
@@ -20,7 +20,7 @@ deploy:
     secure: 6CeYcZ4Ze+57gxfeuHzqP6ldbUkPtF6pfpVM1Gw/K2jExFrAz763gNAQ++tiacq3
   skip_symbols: true
   on:
-    branch: staging
+    branch: develop
 - provider: NuGet
   name: production
   api_key: