finally fix blink1-tool version for zip downloaded makes, issue #2

Makefile

@@ -144,7 +144,7 @@ MACH_TYPE:="$(strip $(shell uname -m))"
 GIT_TAG?="$(strip $(shell git tag 2>&1 | tail -1 | cut -f1 -d' '))"
 # deal with case of no git or no git tags, check for presence of "v" (i.e. "v1.93")
 ifneq ($(findstring v,$(GIT_TAG)), v)
-  GIT_TAG:="v0"
+	GIT_TAG:="v$(strip $(shell data -r . +'%Y%m%d' ))"
 endif
 
 BLINK1_VERSION?="$(GIT_TAG)-$(OS)-$(MACH_TYPE)"