added caching to travis

Author: hs

.travis.yml

@@ -2,8 +2,11 @@ language: node_js
 node_js:
   - "8"
 jobs:
-   include:
-      - stage: build
-        script: grunt build
-      - stage: test
-        script: grunt test
+  include:
+    - stage: build
+      script: grunt build
+    - stage: test
+      script: grunt test
+cache:
+  directories:
+    - "node_modules"

src/Data.jest.ts

@@ -1,3 +1,5 @@
+require('coveralls');
+
 import * as hsdatab     from './';
 import { Data } from './Data';