Add Travis deploy step

Author: Sam Harrison

.travis.yml

@@ -1,10 +1,18 @@
 language: node_js
 node_js:
-  - "4"
-  - "5"
-  - "6"
-  - "7"
-  - "8"
-  - "10"
-  - "lts/*"
-  - "node"
+  - 4
+  - 5
+  - 6
+  - 7
+  - 8
+  - 10
+  - lts/*
+  - node
+deploy:
+  - provider: npm
+    email: [email protected]
+    api_key:
+      secure: EQjq/aPzjHfKGhZE7Lh47DHcGYsnYXL9aEjEPX03CjhLy1QOjVH+qHeb5Ud5t+EVlmsTyK+xMkDuECgA4wb6n4rjaH7XZebMGrkijdQ5zg09qPD8TF5+/gBHIKPdRxlIXoinimsuYDhxvYf3Cq1YSFzZ4+/f/oJOqCjtcNraqQQrdm63WV12tp9fBB8Za2XUo0JTNs0zA4q1qfxp2NSicU9Wf7Cq8ppaV6mngQVd4Q/w/uyGUkOAq/zAjfVYMM0MUmzsPShEI/KaX9/XiUyTIJw+L4SNDHK+zq0Lj3w90oKWaIIioVcB4qi07d0aj0s5xZ8ZxZDr6640p5LpN/lZf5eCMb9ge81OL9Z7CBCtCe1AGk7EJAFBB4WZ9q6MFLfOv5TjEbdADSjbp+0NfhwdPbvrYsN5Z0TkV7sFnQ2LjAwo2CXUu7JItDqKDVuuB36PjPBSAkVN3gxPgUJsBSs1KSFb88ZoVIHLLBfE/vAQGXteBg9e/ScXmzk/59H45gMQozIOggI/3qcK6xaTVk5+IR76tgc1b+G3MGDUpqn4AQyX1wDdWJiIl8jXAJQ27ugqZr0PCKGf3sx/ZUGW03ax6vnb3vUaMce2E5ytLibNDU9vLDPz39gEVQVkV430+qCOC/WPYTOxGBblQLQXOVf8cIY42yzr4IApARs4gbOtllE=
+    on:
+      tags: true
+      node: 10