fix(ci) clone Kong using http not ssh (#15)

.travis.yml

@@ -31,7 +31,7 @@ matrix:
     - env: PACKAGE_TYPE=deb RESTY_IMAGE_BASE=debian RESTY_IMAGE_TAG=testing
 
 install:
-  - git clone --single-branch -b next git@github.com:Kong/kong.git kong
+  - git clone --single-branch -b next https://github.com/Kong/kong.git kong
   - make package-kong
 
 before_script:
@@ -49,4 +49,5 @@ before_script:
   - JSONPATH='{range .items[*]}{@.metadata.name}:{range @.status.conditions[*]}{@.type}={@.status};{end}{end}'; until kubectl get nodes -o jsonpath="$JSONPATH" 2>&1 | grep -q "Ready=True"; do sleep 1; done
 
 script:
-  - make test
+  - make test
+