Issue 126.dockter.1 (#131)

* #126 Migrate from master to main

* #126 Migrate from master to main

CONTRIBUTING.md

@@ -115,7 +115,7 @@ TODO:
 
 ### Pull Requests
 
-Code in the master branch is modified via GitHub pull request.
+Code in the main branch is modified via GitHub pull request.
 Follow GitHub's
 [Creating a pull request from a branch](https://help.github.com/articles/creating-a-pull-request/)
 or

README.md

@@ -80,7 +80,7 @@ These files are packaged in `senzingapi-M.m.P-00000.x86_64.rpm` and `senzingapi_
 
 At [Senzing](http://senzing.com),
 we strive to create GitHub documentation in a
-"[don't make me think](https://github.com/Senzing/knowledge-base/blob/master/WHATIS/dont-make-me-think.md)" style.
+"[don't make me think](https://github.com/Senzing/knowledge-base/blob/main/WHATIS/dont-make-me-think.md)" style.
 For the most part, instructions are copy and paste.
 Whenever thinking is needed, it's marked with a "thinking" icon :thinking:.
 Whenever customization is needed, it's marked with a "pencil" icon :pencil2:.
@@ -127,12 +127,12 @@ The following instructions are used when modifying and building the Docker image
 These are "one-time tasks" which may already have been completed.
 
 1. The following software programs need to be installed:
-    1. [git](https://github.com/Senzing/knowledge-base/blob/master/HOWTO/install-git.md)
+    1. [git](https://github.com/Senzing/knowledge-base/blob/main/HOWTO/install-git.md)
 
 ### Clone repository
 
 For more information on environment variables,
-see [Environment Variables](https://github.com/Senzing/knowledge-base/blob/master/lists/environment-variables.md).
+see [Environment Variables](https://github.com/Senzing/knowledge-base/blob/main/lists/environment-variables.md).
 
 1. Set these environment variable values:
 
@@ -143,7 +143,7 @@ see [Environment Variables](https://github.com/Senzing/knowledge-base/blob/maste
     export GIT_REPOSITORY_DIR="${GIT_ACCOUNT_DIR}/${GIT_REPOSITORY}"
     ```
 
-1. Using the environment variables values just set, follow steps in [clone-repository](https://github.com/Senzing/knowledge-base/blob/master/HOWTO/clone-repository.md) to install the Git repository.
+1. Using the environment variables values just set, follow steps in [clone-repository](https://github.com/Senzing/knowledge-base/blob/main/HOWTO/clone-repository.md) to install the Git repository.
 
 ### Create branch
 

bin/github-submodule-versions.py

@@ -28,7 +28,7 @@
 __date__ = '2021-08-14'
 __updated__ = '2022-01-27'
 
-# See https://github.com/Senzing/knowledge-base/blob/master/lists/senzing-product-ids.md
+# See https://github.com/Senzing/knowledge-base/blob/main/lists/senzing-product-ids.md
 SENZING_PRODUCT_ID = "5023"
 log_format = '%(asctime)s %(message)s'