Update core template

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

STM32/src/templates/package_core_index.json

@@ -19,7 +19,7 @@
             {
               "packager": "STM32",
               "name": "STM32Tools",
-              "version": "1.3.0"
+              "version": "1.3.1"
             },
             {
               "packager": "STM32",