Merge pull request bitcoinjs#1740 from finch185277/fix-readme-typo

fix typo in README

Author: junderw

README.md

@@ -84,7 +84,7 @@ If you're familiar with how to use browserify, ignore this and carry on, otherwi
 
 **NOTE**: We use Node Maintenance LTS features, if you need strict ES5, use [`--transform babelify`](https://github.com/babel/babelify) in conjunction with your `browserify` step (using an [`es2015`](https://babeljs.io/docs/plugins/preset-es2015/) preset).
 
-**WARNING**: iOS devices have [problems](https://github.com/feross/buffer/issues/136), use atleast [[email protected]](https://github.com/feross/buffer/pull/155) or greater,  and enforce the test suites (for `Buffer`, and any other dependency) pass before use.
+**WARNING**: iOS devices have [problems](https://github.com/feross/buffer/issues/136), use at least [[email protected]](https://github.com/feross/buffer/pull/155) or greater,  and enforce the test suites (for `Buffer`, and any other dependency) pass before use.
 
 ### Typescript or VSCode users
 Type declarations for Typescript are included in this library. Normal installation should include all the needed type information.