Pin honggfuzz binary version

Author: mbrubeck

fuzz/travis-fuzz.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 set -e
-cargo install --force honggfuzz --version "^0.5.47"
+cargo install --force honggfuzz --version 0.5.47
 for TARGET in fuzz_targets/*; do
     FILENAME=$(basename $TARGET)
 	FILE="${FILENAME%.*}"