Merge pull request #213 from michaelciraci/restrict-half-2.3

Get <1.70 Working Again

Author: johannesvollmer

.gitignore

@@ -9,4 +9,7 @@ testout
 # ignore the files generated by the example
 ./*.exr
 pngs/
-./*.png
+./*.png
+
+# ignore Cargo.lock since this is package
+Cargo.lock