grouped endpoints in readme for clarity

Author: jakewmeyer

README.md

@@ -15,7 +15,9 @@
 <br></br>
 </div>
 
-## Usage / Endpoints
+# Usage / Endpoints
+
+## Basic Info
 Get API info
 ```http
 GET https://api.spacexdata.com
@@ -34,10 +36,21 @@ Get launch site information
 ```http
 GET https://api.spacexdata.com/sites
 ```
+## Launch information by dates
 Get all past launches
 ```http
 GET https://api.spacexdata.com/launches
 ```
+Get past launches by year
+```http
+GET https://api.spacexdata.com/launches/year=2017
+```
+Get past launches in a date range
+```http
+GET https://api.spacexdata.com/launches/from=2011-01-20/to=2017-05-25
+```
+
+## Launch info by serial #'s
 Get launches by core serial #
 ```http
 GET https://api.spacexdata.com/launches/core=B1021
@@ -46,29 +59,25 @@ Get launches by capsule serial #
 ```http
 GET https://api.spacexdata.com/launches/cap=C106
 ```
-Get detailed capsule information by serial #
-```http
-GET https://api.spacexdata.com/parts/cap=C106
-```
+
+## Detailed info about each capsule
 Get detailed info on all capsules
 ```http
 GET https://api.spacexdata.com/parts/caps
 ```
-Get detailed core information by serial #
+Get detailed capsule information by serial #
 ```http
-GET https://api.spacexdata.com/parts/core=B1021
+GET https://api.spacexdata.com/parts/cap=C106
 ```
+
+## Detailed info about each core
 Get detailed info on all cores
 ```http
 GET https://api.spacexdata.com/parts/cores
 ```
-Get past launches by year
-```http
-GET https://api.spacexdata.com/launches/year=2017
-```
-Get past launches in a date range
+Get detailed core information by serial #
 ```http
-GET https://api.spacexdata.com/launches/from=2011-01-20/to=2017-05-25
+GET https://api.spacexdata.com/parts/core=B1021
 ```
 
 Example JSON Response for a launch