build: add husky pre-commit & commit-msg hooks (#181)

* build: add husky pre-commit & commit-msg hooks

This change makes the following tasks run on each commit, at the following sequence:

- `husky:pre-commit` - runs the Grunt `test` task, including lint and test
- `husky:commit-msg` - checks whether the commit message follows https://conventionalcommits.org

.husky/commit-msg

@@ -0,0 +1,5 @@
+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+. "$(dirname "$0")/common.sh"
+
+npm run husky:commit-msg

.husky/common.sh

@@ -0,0 +1,8 @@
+command_exists () {
+    command -v "$1" >/dev/null 2>&1
+}
+
+# Windows 10, Git Bash and Yarn workaround
+if command_exists winpty && test -t 1; then
+    exec < /dev/tty
+fi

.husky/pre-commit

@@ -0,0 +1,5 @@
+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+. "$(dirname "$0")/common.sh"
+
+npm run husky:pre-commit

commitlint.config.js

@@ -0,0 +1 @@
+module.exports = { extends: ['@commitlint/config-conventional'] };