Updated .travis.yml

.travis.yml

@@ -1,9 +1,12 @@
 language: node_js
 node_js:
-- "8.17.0"
-- "9.11.2"
-- "10.22.0"
-- "11.15.0"
-- "12.18.2"
-- "13.14.0"
+- 8.17.0
+- 9.11.2
+- 10.22.0
+- 11.15.0
+- 12.18.2
+- 13.14.0
 after_success: "./node_modules/.bin/nyc report --reporter=text-lcov | ./node_modules/.bin/coveralls"
+notifications:
+  slack:
+    secure: leahWYNItXv4C23j3M6A1CCB8wT3Hu77K1OpCitLiqL8X/O0ww9YnVUr+ZZl1iYyVkNhnDrMXm+uE+jLdZ68FA4dlaGXh4NDybpvNScPFLeGWumvP7n2MRE+8IRXPU2MCWyBYwbpm4JU1t3FC3tFrIiCmAWor0Y7r+la4m31rTkT2CluLt3tm3JspIoh0r3Ca18r4RemqO0DJSjnPvwlyGJpLhp5wFpXnF2mEoV67q2wl5fvF3DGhlw0nXU0Bb9nRC+v7CP7ImWuIuVZPPoymIWLBN5V6CJHEvgc9gBrp5WuPXadGlWTdM/SWD8uv3t6TvWZiq+kIedo9iOcmmSXi3uqYSMBY+L+KHtJOVKeAOodHk/E/T4zw+XJZ2UPAH/Y4YFHTz9kmwcuozLfLqV1EQbipWC014ufWVxDe91fOqnuzrh1oYH2cIAy0s6pt5PHzNQELM/k9jFTPPe6PTqxtp9qkgmEhTcH/cwsFXj1j6jUtfu8+lKJ/m/L2NiUeIj45WCmeRD9vituWlSOlG0gM8sO+6DzBALoLSgAi7ZbhudBWfjYhiIN0KpnAa9ePlfknGsoXbZX8vGk9FQpszgUeCLMIfjoVAp93YyD/nH4DcOwcBaWiB/vsUeww94q4IAGY2vKbJHx+hPmtQ41oUgPT/2+NOjN9K8k0nBuh4Jo3lU=