fix typo

build.sh

@@ -70,7 +70,7 @@ fi
 
 EXECUTABLE_PATH="${GOPATH}/bin/${PLATFORM}_${ARCH}/${BIN_NAME}"
 echo $EXECUTABLE_PATH
-[ -f $EXECUTABLE_PATH] || EXECUTABLE_PATH="${GOPATH}/bin/${BIN_NAME}"
+[ -f $EXECUTABLE_PATH ] || EXECUTABLE_PATH="${GOPATH}/bin/${BIN_NAME}"
 
 run_upx() {
     if ! which upx &>/dev/null; then