Update composer.json

Author: alexdnepro

composer.json

@@ -26,7 +26,7 @@
     "php-64bit": ">=7.0",
     "pleonasm/merkle-tree": "1.0.0",
     "composer/semver": "^1.4.0|^3.2.0",
-    "lastguest/murmurhash": "v2.0.0",
+    "lastguest/murmurhash": "v2.1.1",
     "mdanter/ecc": "^0.5.0",
     "bitwasp/buffertools": "^0.5.0",
     "bitwasp/bech32": "^0.0.1"