fix(deps): move md5.js to dependencies

The dependency md5.js is noted in devDependencies, but it is actually a
production dependency since it is referenced from the class DigestAuth.

Closes #396

Author: mattias-kindborg-at-work

package.json

@@ -40,6 +40,7 @@
   ],
   "dependencies": {
     "debug": "4.1.1",
+    "md5.js": "1.3.5",
     "ws": "7.2.5"
   },
   "devDependencies": {
@@ -66,7 +67,6 @@
     "eslint-plugin-promise": "4.2.1",
     "http-server": "0.12.3",
     "jest": "25.5.4",
-    "md5.js": "1.3.5",
     "mock-socket": "9.0.3",
     "prettier": "2.0.5",
     "ts-jest": "25.4.0",