fix(sourcemaps): inline sourcemaps (#89)

Closes #43
Currently sourcemaps are pointing to an absolute location based on the machine that built the project.
This PR changes that to a relative location, and also inlines the sources.
Inlining should be done since we do not publish the TS files.

Author: filipesilva

http-status-codes.js.map

@@ -4,7 +4,7 @@
     "module": "es2015",
     "moduleResolution": "node",
     "sourceMap": true,
-    "sourceRoot": "./src",
+    "inlineSources": true,
     "declaration": true,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,