fix README

README.md

@@ -1,10 +1,11 @@
 # TinyMT
 [![github actions](https://github.com/torao/tinymt/actions/workflows/build.yml/badge.svg)](https://github.com/torao/tinymt/actions)
+[![torao](https://circleci.com/gh/torao/tinymt.svg?style=svg)](https://app.circleci.com/pipelines/github/torao/tinymt)
 [![docs](https://docs.rs/tinymt/badge.svg)](https://docs.rs/tinymt)
 
 Rust implementation of TinyMT 64/32 - a lightweight variant of Mersenne Twister PRNG.
 
-This create is based on the original [TinyMT 1.1.1](https://github.com/MersenneTwister-Lab/TinyMT) @ 9d7ca3c161
+This crate is based on the original [TinyMT 1.1.1](https://github.com/MersenneTwister-Lab/TinyMT) @ 9d7ca3c161
 implemented in C.
 
 ## Features
@@ -20,9 +21,9 @@ This crate provides the following two TinyMT implementations.
 * TinyMT32 (32-bit version) for `u32` and `f32`. This is also defined as [RFC 8682](https://tools.ietf.org/html/rfc8682) by IEFT.
 * TinyMT64 (64-bit version) for `u64` and `f64`.
 
-TinyMT32 is also used for random numbers to control which monsters will hatch in Pokémon.
+TinyMT32 has also been used for random numbers to control which monsters will hatch in Pokémon.
 
-Note that neither TinyMT nor MT 19937 are cryptographically secure pseudo-random number generators. You shouldn't use them in applications where high security is required.
+Note that neither TinyMT nor MT 19937 are cryptographically secure pseudo-random number generators. You shouldn't use them in applications where high security is required, such as the generation of private keys.
 
 ## Getting Started