Remove local dnspython submodule since the latest dnspython (as of 1.15.0) supports all the requirements

.gitmodules

@@ -1,6 +1,3 @@
 [submodule "cymruwhois"]
 	path = cymruwhois
 	url = https://github.com/JustinAzoff/python-cymruwhois.git
-[submodule "dnspython-orig"]
-	path = dnspython
-	url = https://github.com/rthalley/dnspython/

README.md

@@ -130,8 +130,3 @@ Babak Farrokhi
 
 dnsdiag is released under a 2 clause BSD license.
 
-### Credits
-
-- [@rthalley](https://github.com/rthalley) for invaluable [dnspython](https://github.com/rthalley/dnspython) library
-- [@JustinAzoff](https://github.com/JustinAzoff) for [python-cymruwhois](https://github.com/JustinAzoff/python-cymruwhois) library
-- [@bortzmeyer](https://github.com/bortzmeyer) for his feedback and patches

TODO.md

@@ -1,6 +1,3 @@
 # TODO
 
-- implement basic DNS client functionality into dnstraceroute to eliminate need
-  of modified dnspython module
-- add support for python 2.x for the conservatives and faint-hearted ;-)
 - dnsfingerprint.py tool to fingerprint DNS servers

dns

@@ -1 +0,0 @@
-dnspython/dns

dnspython

@@ -1 +0,0 @@
-Subproject commit a55e23fbc4b960ca7f88342a89404fc07293096c

setup.py

@@ -2,7 +2,7 @@ from setuptools import setup, find_packages
 
 setup(
     name="dnsdiag",
-    version="1.5.0",
+    version="1.5.1",
     packages=find_packages(),
     classifiers=[
         "Topic :: System :: Networking",