Fixes formatting (#515)

Minor formatting Markdown formatting.

Author: vpetersson

README.md

@@ -74,7 +74,7 @@ We've created this [tutorial](/tutorial) to build a basic Slack app in less than
 
 ---
 
-Slack provide a Web API that gives you the ability to build applications that interact with Slack in a variety of ways. This Development Kit is a module based wrapper that makes interaction with that API easier. We have a basic example here with some of the more common uses but a full list of the available methods are available [here][api-methods]. More detailed examples can be found in our [Basic Usage][https://slack.dev/python-slackclient/basic_usage.html] guide
+Slack provide a Web API that gives you the ability to build applications that interact with Slack in a variety of ways. This Development Kit is a module based wrapper that makes interaction with that API easier. We have a basic example here with some of the more common uses but a full list of the available methods are available [here][api-methods]. More detailed examples can be found in our [Basic Usage](https://slack.dev/python-slackclient/basic_usage.html) guide
 
 #### Sending a message to Slack