v3.1.1: bugfix for ovmb eigen property encoders

CHANGELOG

+Version 3.1.1 (2022-07-29):
+  - Fix OVMB property codec names for Eigen float matrices (was "d" instead of "f").
+    Files that were saved with float matrices are unfortunately unreadable and need to be manually fixed.
+
+
 Version 3.1.0 (2022-06-28):
   - Features:
     - Implement mesh copy assignment

CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_policy(VERSION 3.12.0)
 
 
 project (OpenVolumeMesh
-    VERSION 3.1.0
+    VERSION 3.1.1
     LANGUAGES CXX
     HOMEPAGE_URL https://openvolumemesh.org/
     )