Release v0.4.0 (#19)

* Release v0.4.0

* Add no-entrypoint feature description in ReadMe

Author: ali-bahjati

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "pyth-client"
-version = "0.3.0"
-authors = ["Richard Brooks"]
+version = "0.4.0"
+authors = ["Pyth Data Foundation"]
 edition = "2018"
 license = "Apache-2.0"
 homepage = "https://pyth.network"

README.md

@@ -21,6 +21,13 @@ Add a dependency to your Cargo.toml:
 pyth-client="<version>"
 ```
 
+If you want to use this library in your on-chain program you should use `no-entrypoint` feature to prevent conflict between your program and this library's program.
+
+```toml
+[dependencies]
+pyth-client = {version = "<version>", features = ["no-entrypoint"]}
+```
+
 See [pyth-client on crates.io](https://crates.io/crates/pyth-client/) to get the latest version of the library.
 
 ## Usage