README: Add npm info image

intelliot · web-flow · commit f551d4ccbe62 · 2019-09-04T00:09:55.000-07:00
diff --git a/README.md b/README.md
@@ -1,3 +1,5 @@
 ripple-hashes
 =============
 Methods to hash Ripple objects
+
+[![NPM](https://nodei.co/npm/ripple-hashes.png)](https://www.npmjs.org/package/ripple-hashes)
