Add david-dm live badge #11

Still need to figure out how to get dev/peer/optional deps info

libs/live-fns/_index.js

@@ -3,6 +3,7 @@ module.exports = {
   'chrome-web-store': require('./chrome-web-store.js'),
   'circleci': require('./circleci.js'),
   'crates': require('./crates.js'),
+  'david': require('./david.js'),
   'homebrew': require('./homebrew.js'),
   'npm': require('./npm.js')
 }

libs/live-fns/david.js

@@ -0,0 +1,23 @@
+const axios = require('../axios.js')
+
+const statusInfo = {
+  'insecure': ['insecure', 'red'],
+  'outofdate': ['out of date', 'orange'],
+  'notsouptodate': ['up to date', 'yellow'],
+  'uptodate': ['up to date', 'green'],
+  'none': ['pending', 'grey']
+}
+
+module.exports = async function (depType, user, repo) {
+  const endpoint = `https://david-dm.org/${user}/${repo}/info.json`
+  const { status } = await axios.get(endpoint).then(res => res.data)
+
+  switch (depType) {
+    case 'dep':
+      return {
+        subject: 'dependencies',
+        status: statusInfo[status][0],
+        color: statusInfo[status][1]
+      }
+  }
+}