docs: Add Flame to libraries using vector_math (#256)

diff --git a/README.md b/README.md
index eba244e..01cff7e 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,7 @@
 ## Libraries using vector_math
 
 * [Flutter](https://github.com/flutter/flutter)
+* [Flame](https://github.com/flame-engine/flame)
 
 ## Examples