force generic-pool to 2.4.4

For #13

Author: bitsofinfo

package.json

@@ -26,7 +26,7 @@
         "buffer-builder":"latest",
         "fifo":"latest",
         "promise":"latest",
-        "generic-pool":"latest"
+        "generic-pool":"2.4.4"
     },
     "devDependencies":{
         "mocha":"latest"