Fix "are you running this correctly?" check to utilise pathlib

As it was this only worked on systems with `/`-delimited path components.

So use `pathlib.Path.as_posix()` to ensure it *is* in that format.

src/eddn/Bouncer.py

@@ -28,12 +28,13 @@ Architecture:
 """
 import argparse
 import logging
+import pathlib
 import sys
 import zlib
 from datetime import datetime
 from typing import Callable
 
-if sys.path[0].endswith('/eddn'):
+if pathlib.Path(sys.path[0]).as_posix().endswith('/eddn'):
     print(sys.path)
     print(
         '''

src/eddn/Gateway.py

@@ -8,12 +8,13 @@ market data to the Announcer daemons.
 """
 
 import argparse
+import pathlib
 import sys
 import zlib
 from datetime import datetime
 from typing import Dict
 
-if sys.path[0].endswith('/eddn'):
+if pathlib.Path(sys.path[0]).as_posix().endswith('/eddn'):
     print(sys.path)
     print(
         '''

src/eddn/Monitor.py

@@ -5,12 +5,13 @@ import argparse
 import collections
 import datetime
 import logging
+import pathlib
 import sys
 import zlib
 from threading import Thread
 from typing import OrderedDict
 
-if sys.path[0].endswith('/eddn'):
+if pathlib.Path(sys.path[0]).as_posix().endswith('/eddn'):
     print(sys.path)
     print(
         '''

src/eddn/Relay.py

@@ -4,13 +4,14 @@
 import argparse
 import hashlib
 import logging
+import pathlib
 import sys
 import time
 import uuid
 import zlib
 from threading import Thread
 
-if sys.path[0].endswith('/eddn'):
+if pathlib.Path(sys.path[0]).as_posix().endswith('/eddn'):
     print(sys.path)
     print(
         '''