Fix a couple of typos in README

Author: tuomasjjrasanen

README

@@ -28,7 +28,7 @@ How to report bugs
 The bug database is hosted in GitHub. If you have found a bug or have an
 improvement idea you want to share, please report it at
 <https://github.com/tuomasjjrasanen/libsuinput/issues>. However, to avoid
-duplicate bug reports, before reporting, please check if similiar or identical
+duplicate bug reports, before reporting, please check if similar or identical
 bug has already been reported.  If so, you can still subscribe to the existing
 bug to track its progress.
 
@@ -38,7 +38,7 @@ How to contribute
 In addition to reporting bugs and improvement suggestions, you are encouraged to
 contribute bug-fixes or features. Source code is maintained in Git and the main
 repository is hosted at GitHub,
-<https://github.com/tuomasjjrasanen/libsuinput/>. The preferred way to contibute
+<https://github.com/tuomasjjrasanen/libsuinput/>. The preferred way to contribute
 code is to clone the main Git repository and send a pull-request. Good old
 patches via email are also accepted.