Use git-tagged version when packaging

`git describe --tags` returns a version string like '5.2-36-g15f7925'
when on commit g15f7925, which is 36 commits after the tag 5.2.
This is a more clear version when between releases.

Makefile

@@ -5,3 +5,6 @@ dep:
 
 build:
 	docker run --rm -v ${PWD}:/opt fira:latest ./script/build
+
+package:
+	./script/package

script/package

@@ -1,22 +1,7 @@
 #!/bin/zsh -euo pipefail
 cd "`dirname $0`/.."
 
-setopt BASH_REMATCH
-MAJOR=`cat FiraCode.glyphs | grep versionMajor`
-VERSION=""
-
-if [[ $MAJOR =~ 'versionMajor = ([0-9]+);' ]] ; then
-    VERSION="${BASH_REMATCH[2]}"
-fi
-
-MINOR=`cat FiraCode.glyphs | grep versionMinor`
-if [[ $MINOR =~ 'versionMinor = ([0-9]+);' ]] ; then
-    MATCH="${BASH_REMATCH[2]}"
-    if [ "$MATCH" != "0" ] ; then
-        VERSION="$VERSION.$MATCH"
-    fi
-fi
-
+VERSION="$(git describe --tags)"
 FILE="Fira_Code_v$VERSION.zip"
 rm -f $FILE