Update defaults for running aggregator script

Jonathan S. Katz · Jonathan S. Katz · commit 314da2553823 · 2021-04-29T14:50:21.000-04:00
If $GOPATH is unset, this will default to using the standard
module GOPATH.
diff --git a/bin/license_aggregator.sh b/bin/license_aggregator.sh
@@ -14,7 +14,7 @@
 # limitations under the License.
 
 # Inputs / outputs
-SCAN_DIR=${GOPATH}/pkg/mod
+SCAN_DIR=${GOPATH:-~/go}/pkg/mod
 OUT_DIR=licenses
 
 # Fail on error
