remove subheadline for radius parameter

Author: lonvia

README.md

@@ -251,7 +251,6 @@ http://localhost:2322/api?q=berlin&lon=10&lat=52&zoom=12&location_bias_scale=0.1
 http://localhost:2322/reverse?lon=10&lat=52
 ```
 
-#### Reverse geocode a coordinate with radius
 An optional radius parameter can be used to specify a value in kilometers
 to reverse geocode within. The value has to be greater than 0 and lower than 5000.