Added master makefile target show-version for showing current project version.

This feature will be used in our automated build system.

Makefile

@@ -68,6 +68,7 @@ help:
 	@echo ""
 	@echo "  * ${GREEN}default${NC}: alias for help, you have to pick a target"
 	@echo "  * ${GREEN}help${NC}: print this help and exit"
+	@echo "  * ${GREEN}show-version${NC}: show current project version"
 	@echo "  * ${GREEN}full${NC}: generate documentation, archive previous packages, build new distribution and deploy to PyPI"
 	@echo "  * ${GREEN}build${NC}: archive previous packages and build new distribution"
 	@echo "  * ${GREEN}buildbot${NC}: build new distribution using buildbot automated system"
@@ -96,6 +97,13 @@ help:
 #-------------------------------------------------------------------------------
 
 
+show-version: FORCE
+	@PYTHONPATH=lib python3 -c "import typedcols; print(typedcols.__version__);"
+
+
+#-------------------------------------------------------------------------------
+
+
 deps: deps-python
 
 deps-python: FORCE