Allow bash script to execute from any directory
The current version assumes you're executing `protoc-gen-dart`
from the root of this repo, and it fails if you execute it from
anywhere else. This change allows you to execute it from any
working directory.
diff --git a/bin/protoc-gen-dart b/bin/protoc-gen-dart
index 7b398d0..63570e8 100755
--- a/bin/protoc-gen-dart
+++ b/bin/protoc-gen-dart
@@ -1,2 +1,3 @@
#!/bin/bash
-dart bin/protoc_plugin.dart -c "$@"
+BINDIR=$(dirname "$(readlink -f "$0")")
+dart "$BINDIR/protoc_plugin.dart" -c "$@"
