Update README.md

Author: davidblewett

README.md

@@ -184,7 +184,7 @@ re-exported as rdkafka features.
 
 ### Minimum supported Rust version (MSRV)
 
-The current minimum supported Rust version (MSRV) is 1.45.0. Note that
+The current minimum supported Rust version (MSRV) is 1.61.0. Note that
 bumping the MSRV is not considered a breaking change. Any release of
 rust-rdkafka may bump the MSRV.