Update dependencies as part of the build

gh_task.go

@@ -47,6 +47,14 @@ func TaskCrossCompile(t *tasking.T) {
 		return
 	}
 
+	// TODO: use a dependency manager that has versioning
+	t.Log("Updating dependencies...")
+	err = t.Exec("go get -u ./...")
+	if err != nil {
+		t.Errorf("Can't update goxc: %s\n", err)
+		return
+	}
+
 	t.Logf("Cross-compiling gh for %s...\n", runtime.GOOS)
 	err = t.Exec("goxc", "-wd=.", "-os="+runtime.GOOS, "-c="+runtime.GOOS)
 	if err != nil {