fix spelling

Author: ItsNickBarry

README.md

@@ -46,7 +46,7 @@ The arbitrary constants `HyperbolicCanvas.INFINITY` and `HyperbolicCanvas.ZERO`
 
 This library uses [Jasmine specs][jasmine] to validate the code and prevent regressions.
 
-The specs have been written to use random input values.  While this approach is unconventional, it provides more convidence than would an attempt to test an effectively infinite number of edge cases<!-- ha!  Get it? -->.  Some specs do occasionally fail; the frequency at which this occurs is determined by the accuracy of the constants `HyperbolicCanvas.INFINITY` and `HyperbolicCanvas.ZERO`.
+The specs have been written to use random input values.  While this approach is unconventional, it provides more confidence than would an attempt to test an effectively infinite number of edge cases<!-- ha!  Get it? -->.  Some specs do occasionally fail; the frequency at which this occurs is determined by the accuracy of the constants `HyperbolicCanvas.INFINITY` and `HyperbolicCanvas.ZERO`.
 
 The Jasmine library itself has been modified to run each spec multiple times, and a random number seed is used so that errors may be reproduced.  The seed and the spec run count can be set in the options menu on the [SpecRunner][jasmine] page.