changed order of args

Author: TakaakiFuruse

README.md

@@ -41,7 +41,7 @@ For other spaces use the nmslib library https://github.com/nmslib/nmslib.
 * `hnswlib.Index(space, dim)` creates a non-initialized index an HNSW in space `space` with integer dimension `dim`.
 
 `hnswlib.Index` methods:
-* `init_index(max_elements, ef_construction = 200, M = 16, random_seed = 100)` initializes the index from with no elements. 
+* `init_index(max_elements, M = 16, ef_construction = 200, random_seed = 100)` initializes the index from with no elements. 
     * `max_elements` defines the maximum number of elements that can be stored in the structure(can be increased/shrunk).
     * `ef_construction` defines a construction time/accuracy trade-off (see [ALGO_PARAMS.md](ALGO_PARAMS.md)).
     * `M` defines tha maximum number of outgoing connections in the graph ([ALGO_PARAMS.md](ALGO_PARAMS.md)).