Add basic unit tests for SignaturePad class

Unfortunately, drawing on a canvas gives slightly different results on different platforms, so one can't compare raw image data, because if it passes e.g. on Mac, it will fail on Linux :/ Most likely something like 'looks-same' needs to be used instead.
szimek · Apr 16, 2018 · 7d49c1f · 7d49c1f
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diff --git a/.travis.yml b/.travis.yml
@@ -0,0 +1,8 @@
+language: node_js
+
+node_js:
+  - "8"
+  - "9"
+
+cache:
+  yarn: true
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,14 @@
 ## Changelog
 
+### master
+#### Bug fixes
+- Fix error in `touchend` event handler.
+- Make both params in `#toDataURL` optional to match `Canvas#toDataURL`.
+
+#### Features
+- Add optional callback param to `#fromDataURL`.
+- Add basic unit tests for SignaturePad class.
+
 ### 3.0.0-beta.1
 #### Breaking changes
 - Rewrite library using TypeScript. TypeScript declaration files are now provided by the library. Hopefully, it should be a bit easier to refactor now...