build frontend with travis

.travis.yml

@@ -2,6 +2,40 @@ dist: xenial
 
 matrix:
   include:
+    - language: node_js
+      node_js: "10"
+      before_install:
+        - cd web
+      install:
+        - npm install
+      script:
+        - npm run build
+
+    - language: node_js
+      node_js: "11"
+      before_install:
+        - cd web
+      install:
+        - npm install
+      script:
+        - npm run build
+
+    - language: node_js
+      node_js: "12"
+      before_install:
+        - cd web
+      install:
+        - npm install
+      script:
+        - npm run build
+
+    - language: node_js
+      node_js: "10"
+      before_script:
+        - mkdir meshcentral && cd meshcentral
+      script:
+        - npm install meshcentral
+
     - language: node_js
       node_js: "11"
       before_script: