Update README.md: Leaflet 1.0.0 weights 37KiB, not 33KiB

Author: IvanSanchez

README.md

@@ -1,7 +1,7 @@
 <img width="600" src="https://rawgit.com/Leaflet/Leaflet/master/src/images/logo.svg" alt="Leaflet" />
 
 Leaflet is the leading open-source JavaScript library for **mobile-friendly interactive maps**.
-Weighing just about 33 KB of gzipped JS code, it has all the mapping [features][] most developers ever need.
+Weighing just about 37 KB of gzipped JS code, it has all the mapping [features][] most developers ever need.
 
 Leaflet is designed with *simplicity*, *performance* and *usability* in mind.
 It works efficiently across all major desktop and mobile platforms out of the box,