docs: Update README.md (open-feature#604)

Signed-off-by: David Hirsch <[email protected]>

Author: DavidPHirsch

Diff for: README.md

@@ -39,7 +39,7 @@
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-[OpenFeature](https://openfeature.dev) is an open standard that provides a vendor-agnostic, community-driven API for feature flagging that works with your favorite feature flag management tool.
+[OpenFeature](https://openfeature.dev) is an open specification that provides a vendor-agnostic, community-driven API for feature flagging that works with your favorite feature flag management tool.
 
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 ## 🚀 Quick start