Merge pull request #24 from Wingless-Archangel/update-documentation

Update authentication Documentation

README.md

@@ -76,14 +76,20 @@ docker run --rm --name erlangbuilder -v ${PWD}:/bec  -w=/bec  erlang rebar3 escr
 
 ## Sample BitBucket Configuration
 
+BEC supports both Basic Authentication (via username/password) and Token-Based Authentication (preferred).
+If both a `token` and a `username/password` pair are provided, the token will take precedence.
+
 Set BitBucket url and credentials in `bitbucket.config`:
 
 ```
 {bitbucket_url, "https://my.bitbucket.server"}.
 {bitbucket_username, "first.last"}.
 {bitbucket_password, "password"}.
+{bitbucket_token, "someToken"}.
 ```
 
+Please follow [this](https://confluence.atlassian.com/bitbucketserver072/personal-access-tokens-1005335924.html#Personalaccesstokens-Generatingpersonalaccesstokens) guide if you want to generate the token to authenticate.
+
 ## Sample Repo Configuration
 
 You can find a sample configuration file for a custom BitBucket repo