Add Mongoose v715 support (#14)

Author: matth-x

CHANGELOG.md

@@ -3,7 +3,7 @@
 ## Unreleased
 
 ### Added
-- Mongoose v7.13 support ([#11](https://github.com/matth-x/MicroOcppMongoose/pull/11))
+- Mongoose v7.13 - v7.15 support ([#11](https://github.com/matth-x/MicroOcppMongoose/pull/11), [#14](https://github.com/matth-x/MicroOcppMongoose/pull/14))
 - OCPP 2.0.1 BasicAuthPassword integration ([#13](https://github.com/matth-x/MicroOcppMongoose/pull/13))
 
 ### Fixed

src/MicroOcppMongooseClient.cpp

@@ -17,6 +17,7 @@
 #define MO_MG_V708 708
 #define MO_MG_V713 713
 #define MO_MG_V714 714
+#define MO_MG_V715 715
 
 #ifndef MO_MG_USE_VERSION
 #if defined(MO_MG_VERSION_614)