README.md in ffi-hydrogen-0.1.2

- old
+ new

@@ -1,2 +1,3 @@
 - `libhydrogen` was downloaded from https://github.com/jedisct1/libhydrogen at this sha: 39eb529905.
 - `stringencoders` was downloaded from https://github.com/client9/stringencoders at this sha: e1448a9415.
+    - Modified `padchar` and `b64chars` to be URL safe.