Release automation (#1720)

* Create autoamtic release script.

* Add changelog update date script.

* Improve release scripts.

* Apply suggestions from code review

Co-Authored-By: nventuro <nicolas.venturo@gmail.com>

* Apply suggestions from code review

Co-Authored-By: nventuro <nicolas.venturo@gmail.com>

* Remove moment dependency.

scripts/release/update-ethpm-version.js

@@ -0,0 +1,16 @@
+#!/usr/bin/env node
+
+// Synchronizes ethpm.json version number with package.json.
+// This is run automatically when npm version is run.
+
+const fs = require('fs');
+const cp = require('child_process');
+
+const pkg = require('../../package.json');
+const ethpm = require('../../ethpm.json');
+
+ethpm.version = pkg.version;
+
+fs.writeFileSync('ethpm.json', JSON.stringify(ethpm, null, 2) + '\n');
+
+cp.execSync('git add ethpm.json');