Expose some functions from _base in top-level init

[stevenheidel]

from rpcq._base import from_yaml_file is really useful so it shouldn't come from a private import

[xgallom]

Hi, if you are interested, I've done as you've requested:

diff --git a/rpcq/__init__.py b/rpcq/__init__.py
index 9781258..c968910 100644
--- a/rpcq/__init__.py
+++ b/rpcq/__init__.py
@@ -1,3 +1,4 @@
 from rpcq._client import Client
 from rpcq._server import Server
+from rpcq._base import to_msgpack, from_msgpack, to_json, from_json, to_yaml_file, from_yaml_file
 from rpcq.version import __version__
diff --git a/rpcq/_client.py b/rpcq/_client.py
index abf7403..f656a9a 100644
--- a/rpcq/_client.py
+++ b/rpcq/_client.py
@@ -21,7 +21,7 @@ from typing import Dict, Union
 import zmq
 import zmq.asyncio
 
-from rpcq._base import to_msgpack, from_msgpack
+from rpcq import to_msgpack, from_msgpack
 import rpcq._utils as utils
 from rpcq.messages import RPCError, RPCReply
 
diff --git a/rpcq/_server.py b/rpcq/_server.py
index 2b23d4f..f2ae058 100644
--- a/rpcq/_server.py
+++ b/rpcq/_server.py
@@ -24,7 +24,7 @@ from datetime import datetime
 
 import zmq.asyncio
 
-from rpcq._base import to_msgpack, from_msgpack
+from rpcq import to_msgpack, from_msgpack
 from rpcq._spec import RPCSpec
 from rpcq.messages import RPCRequest
 
diff --git a/rpcq/test/test_base.py b/rpcq/test/test_base.py
index 3737cf7..cc5d386 100644
--- a/rpcq/test/test_base.py
+++ b/rpcq/test/test_base.py
@@ -19,7 +19,7 @@ import logging
 import numpy as np
 import pytest
 
-from rpcq._base import to_msgpack, from_msgpack
+from rpcq import to_msgpack, from_msgpack
 from rpcq.messages import (RPCError)
 
 log = logging.getLogger(__file__)
diff --git a/rpcq/test/test_rpc.py b/rpcq/test/test_rpc.py
index 50ee19b..898df4b 100644
--- a/rpcq/test/test_rpc.py
+++ b/rpcq/test/test_rpc.py
@@ -23,7 +23,7 @@ from multiprocessing import Process
 import pytest
 import zmq
 
-from rpcq._base import to_msgpack, from_msgpack
+from rpcq import to_msgpack, from_msgpack
 from rpcq._server import Server
 from rpcq._client import Client
 from rpcq._utils import rpc_request, RPCErrorError, RPCError

[stevenheidel]

Awesome - can you open a pull request?