Remove wait_time.

prrt/prrt.pyx

@@ -109,7 +109,7 @@ cdef class PrrtSocket:
                 raise Exception("Not a sender.")
             return cprrt.PrrtSocket_get_rtt(self._c_socket) * 0.000001
 
-    def recv(self, wait_time):
+    def recv(self):
         cdef char buffer[65536]
         cdef int32_t len
         with nogil: