Update configuration docs with case_sensitive token option

Author: jb3

docs/configuration.md

@@ -51,11 +51,14 @@ color = "#ff5f5f"
 
 [[olli.tokens]]
 token = "INFO"
+case_sensitive = true
 # When no color is provided it falls back to blurple.
 ```
 
 Tokens accept a `token` and `color` key, the first one is required. `token` represents the phrase that should be searched for and `color` is a hex color (**with** hashtag) that will be used for the generated embeds.
 
+Tokens also accept a `case_sensitive` key which defaults to `false`. If you want to match the case as written in the `token` field set `case_sensitive` to `true` in the token config.
+
 ## `loki`
 
 `api_url`: The base URL of your Loki instance, for example `"http://localhost:3100/"`.
@@ -94,6 +97,7 @@ color = "#ff5f5f"
 [[olli.tokens]]
 token = "WARN"
 color = "#ffe24d"
+case_sensitive = true
 
 [[olli.tokens]]
 token = "INFO"