Fix spelling in README.md (#1017)

Author: fnogatz

README.md

@@ -5,7 +5,7 @@
 For an introduction to Jsonnet and documentation,
 [visit our website](https://jsonnet.org).
 
-This respositiory contains the original implementation. You can also try [go-jsonnet](https://github.com/google/go-jsonnet), a newer implementation which in some cases is orders of magnitude faster.
+This repository contains the original implementation. You can also try [go-jsonnet](https://github.com/google/go-jsonnet), a newer implementation which in some cases is orders of magnitude faster.
 
 Visit our [discussion forum](https://groups.google.com/g/jsonnet).