Fixed unused variable in test method

The startpoint variable wasn't used when calculating the endpoint.

test/calculations_test.rb

@@ -216,7 +216,7 @@ class CalculationsTest < Test::Unit::TestCase
       rheading = [*0..359].sample
       rdistance = [*0..100].sample
       startpoint = [45.0906, 7.6596]
-      endpoint = Geocoder::Calculations.endpoint([45.0906, 7.6596], rheading, rdistance)
+      endpoint = Geocoder::Calculations.endpoint(startpoint, rheading, rdistance)
       assert_in_delta rdistance, Geocoder::Calculations.distance_between(startpoint, endpoint), 1E-5
       assert_in_delta rheading, Geocoder::Calculations.bearing_between(startpoint, endpoint), 1E-2
     end