ci(kitchen+travis): modify matrix to include `develop` platform

.travis.yml

@@ -26,8 +26,12 @@ services:
 #       Ref: https://github.com/saltstack-formulas/template-formula/issues/121
 env:
   matrix:
+    - INSTANCE: repositories-debian-9-develop-py3
+    # - INSTANCE: repositories-ubuntu-1804-develop-py3
     - INSTANCE: repositories-debian-9-2019-2-py3
     - INSTANCE: repositories-ubuntu-1804-2019-2-py3
+    - INSTANCE: preferences-debian-9-develop-py3
+    # - INSTANCE: preferences-ubuntu-1804-develop-py3
     - INSTANCE: preferences-debian-9-2019-2-py3
     - INSTANCE: preferences-ubuntu-1804-2019-2-py3
 

kitchen.yml

@@ -11,6 +11,21 @@ driver:
 # Make sure the platforms listed below match up with
 # the `env.matrix` instances defined in `.travis.yml`
 platforms:
+  ## SALT `develop`
+  - name: debian-9-develop-py3
+    driver:
+      image: netmanagers/salt-develop-py3:debian-9
+      provision_command:
+        - curl -o bootstrap-salt.sh -L https://bootstrap.saltstack.com
+        - sh bootstrap-salt.sh -XdPbfrq -x python3 git develop
+  - name: ubuntu-1804-develop-py3
+    driver:
+      image: netmanagers/salt-develop-py3:ubuntu-18.04
+      provision_command:
+        - curl -o bootstrap-salt.sh -L https://bootstrap.saltstack.com
+        - sh bootstrap-salt.sh -XdPbfrq -x python3 git develop
+
+  ## SALT 2019.2
   - name: debian-9-2019-2-py3
     driver:
       image: netmanagers/salt-2019.2-py3:debian-9