fix wrong use of -i flag in zip command

Author: psteinb

commands.mk

@@ -1,8 +1,8 @@
 files/snakemake-lesson.tar.gz: files/snakemake-lesson/*py
-	@rm -vf $@ && cd files && tar czf $@ snakemake-lesson/*py snakemake-lesson/books/* snakemake-lesson/matplotlibrc snakemake-lesson/cluster.json snakemake-lesson/.Snakefile
+	@rm -vf $@ && cd files && tar vczf ../$@ snakemake-lesson/*py snakemake-lesson/books/* snakemake-lesson/matplotlibrc snakemake-lesson/cluster.json snakemake-lesson/.Snakefile
 
 files/snakemake-lesson.zip: files/snakemake-lesson/*py
-	@rm -vf $@ && cd files && zip $@ -i snakemake-lesson/*py -i snakemake-lesson/books/* -i snakemake-lesson/matplotlibrc -i snakemake-lesson/cluster.json -i snakemake-lesson/.Snakefile
+	@rm -vf $@ && cd files && zip ../$@ snakemake-lesson/*py snakemake-lesson/books/* snakemake-lesson/matplotlibrc snakemake-lesson/cluster.json snakemake-lesson/.Snakefile
 
 ## prep-release     : compress contents of snakemake-lesson for release
 prep-release: files/snakemake-lesson.zip files/snakemake-lesson.tar.gz