updated README

Author: afrigeri

README.md

@@ -1,7 +1,7 @@
 
 ![QGIS](docs/images/ss02.png)
 
-# gsymblib: Geologic mapping symbols library and development for QGIS
+# gsymblib: Geologic mapping symbol library and development for QGIS
 #### Alessandro Frigeri, IAPS/INAF - Dec, 2021
 
 
@@ -24,7 +24,7 @@ The features of __gsymblib__ are:
 
 ## System requirements
 
-A functional QGIS 3.8.x (released on June 21st, 2019) or more recent software installation on MS Windows, OS X or GNU/Linux.  For building the library on your own or developing the build framework, we spot QGIS 3.10 LTR as the target version.
+A functional QGIS 3.22.x (released on Nov, 2021) or more recent software installation on MS Windows, OS X or GNU/Linux.  For building the library on your own or developing the build framework, we spot QGIS 3.10 LTR as the target version.
 
 ## Installation and setup