correct typo in readme

README.md

@@ -9,7 +9,7 @@
 `vgt` is a tool for visualising Go test results in a browser.
 
 It's helpful with understanding parallelism of tests and identifying slow tests.
-More information can be found in our [blog post about optimsing Go tests parallelism](https://threedots.tech/post/go-test-parallelism/).
+More information can be found in our [blog post about optimising Go tests parallelism](https://threedots.tech/post/go-test-parallelism/).
 
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