docs: Update README.md (#19)

reducing the use of the word standard as requested by the CNCF

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

Author: DavidPHirsch

README.md

@@ -15,7 +15,7 @@
 
 ### What is OpenFeature?
 
-[OpenFeature][openfeature-website] 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][openfeature-website] is an open specification that provides a vendor-agnostic, community-driven API for feature flagging that works with your favorite feature flag management tool.
 
 ### Why standardize feature flags?