refactor: use spec-compliant variable names for pool settings

Author: mbroadst

lib/topologies/native_topology.js

@@ -15,7 +15,8 @@ class NativeTopology extends Topology {
         cursorFactory: Cursor,
         reconnect: false,
         emitError: typeof options.emitError === 'boolean' ? options.emitError : true,
-        size: typeof options.poolSize === 'number' ? options.poolSize : 5,
+        maxPoolSize: typeof options.poolSize === 'number' ? options.poolSize : 5,
+        minPoolSize: typeof options.minSize === 'number' ? options.minSize : 0,
         monitorCommands:
           typeof options.monitorCommands === 'boolean' ? options.monitorCommands : false
       }