Updated some files

Author: rickecon

README.md

@@ -10,7 +10,7 @@ This repository contains the source material, code, and data for the book, [*Com
 
 The materials for the book are constantly being updated. The version number listed in the [Releases](https://github.com/OpenSourceEcon/CompMethods/releases) section of the repository tracks the updates, as well as the [`CHANGELOG.md`](CHANGELOG.md) file.
 
-As an open executable book project, this book is happy to receive, address, and incorporate collaborative additions, corrections, suggestions, and questions. Please see the [Contributor Guide]() in the book for how to best collaborate with the project.
+As an open executable book project, this book is happy to receive, address, and incorporate collaborative additions, corrections, suggestions, and questions. Please see the [Contributor Guide](https://opensourceecon.github.io/CompMethods/contrib/contributing.html) in the book for how to best collaborate with the project.
 
 [Richard W. Evans, Phd](https://sites.google.com/site/rickecon) ([@rickecon](https://github.com/rickecon)) is the author of the book and the core maintainer of this repository.
 

docs/book/contrib/contributing.md

@@ -30,13 +30,7 @@ All pull requests must be reviewed by someone else than their original author, w
 
 This project follows the [semantic versioning protocol](http://semver.org/). Any change impacts the version number, and the version number conveys API compatibility information **only**.
 
-Every pull request submitted to the main branch of the repository should update the `CHANGELOG.md` and `changelog.yaml` files as well as update the version number of the project in `setup.py`. These version updates to the version number and to the changelog file descriptions have the following structure and format:
-```yaml
-- bump: {major, minor, patch}
-  changes:
-    {added, removed, changed, fixed}:
-      - <variable or program>
-```
+Every pull request submitted to the main branch of the repository should update the `CHANGELOG.md` file as well as update the version number of the project in `setup.py`.
 
 ### Patch bump (3rd digit update)