Update README.md

Correcting a typo
Merge pull request #87 from lazaruslarue/patch-1

Update README.md
Updated bufferput dependency to bitpays repository.
ECDSA key browser work
browser ECDSA compressed key generated
Key tests working in the browser~!!!
all tests working in browser :D
load test data from files
Merge pull request #90 from trapp/issue-88-wrong-bufferput

Updated bufferput dependency to bitpays repository.
Clean up & fix examples
Merge pull request #86 from maraoz/feature/browserify-ecdsa

Feature/browserify ecdsa
Merge pull request #91 from SomeoneWeird/master

Clean up & fix examples