ci(nightly): forcing travis to grab the develop branch

Author: ashblue

publish-nightly.sh

@@ -6,12 +6,15 @@ setup_git() {
 }
 
 update_nightly_branch() {
+    git remote add origin-nightly https://${GH_TOKEN}@github.com/ashblue/fluid-behavior-tree.git
+    git fetch
+    git checkout -b develop origin-nightly/develop
+
     printf "Current Git details \n"
     git rev-parse HEAD
     git branch | grep \* | cut -d ' ' -f2
 
     printf "Run nightly update \n"
-    git remote add origin-nightly https://${GH_TOKEN}@github.com/ashblue/fluid-behavior-tree.git
     git subtree push --prefix Assets/FluidBehaviorTree origin-nightly nightly
 }