fix(build): transition default branch master -> main

.releaserc

@@ -1,6 +1,6 @@
 {
   "debug": true,
-  "branches": [ "master" ],
+  "branches": [ "main" ],
   "verifyConditions": ["@semantic-release/changelog", "@semantic-release/npm", "@semantic-release/git"],
   "prepare": ["@semantic-release/changelog", "@semantic-release/npm", "@semantic-release/git"],
   "publish": [

.travis.yml

@@ -22,4 +22,4 @@ deploy:
   script: npx semantic-release
   on:
     node: 12
-    branch: master
+    branch: main

CONTRIBUTING.md

@@ -11,4 +11,4 @@ already encountered this issue.
 
 # General Information
 For general guidance on contributing to this project, please see
-[this link](https://github.com/IBM/ibm-cloud-sdk-common/blob/master/CONTRIBUTING_nodejs.md)
+[this link](https://github.com/IBM/ibm-cloud-sdk-common/blob/main/CONTRIBUTING_nodejs.md)

README.md

@@ -1,9 +1,9 @@
-[![Build Status](https://travis-ci.com/IBM/platform-services-node-sdk.svg?branch=master)](https://travis-ci.com/IBM/platform-services-node-sdk)
+[![Build Status](https://travis-ci.com/IBM/platform-services-node-sdk.svg?branch=main)](https://travis-ci.com/IBM/platform-services-node-sdk)
 [![Release](https://img.shields.io/github/v/release/IBM/platform-services-node-sdk)](https://github.com/IBM/platform-services-node-sdk/releases/latest)
 [![npm](https://img.shields.io/npm/v/ibm-platform-services)](https://www.npmjs.com/package/ibm-platform-services)
 ![npm](https://img.shields.io/npm/dm/ibm-platform-services)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
-[![codecov](https://codecov.io/gh/IBM/platform-services-node-sdk/branch/master/graph/badge.svg)](https://codecov.io/gh/IBM/platform-services-node-sdk)
+[![codecov](https://codecov.io/gh/IBM/platform-services-node-sdk/branch/main/graph/badge.svg)](https://codecov.io/gh/IBM/platform-services-node-sdk)
 [![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
 
 # IBM Cloud Platform Services Node.js SDK
@@ -80,7 +80,7 @@ npm install ibm-platform-services
 ```
 
 ## Using the SDK
-For general SDK usage information, please see [this link](https://github.com/IBM/ibm-cloud-sdk-common/blob/master/README.md)
+For general SDK usage information, please see [this link](https://github.com/IBM/ibm-cloud-sdk-common/blob/main/README.md)
 
 ## Questions