Update Dmitry's email address in several places

per https://github.com/iterative/dvc/pull/3244#pullrequestreview-349888033

debian/changelog

@@ -2,4 +2,4 @@ dvc (0.75.b1) experimental; urgency=low
 
   * First native Debian package version.
 
- -- Dmitry Petrov <dmitry@dataversioncontrol.com>  Sat, 07 Dec 2019 09:49:28 +0300
+ -- Dmitry Petrov <dmitry@dvc.org>  Sat, 07 Dec 2019 09:49:28 +0300

debian/control

@@ -1,5 +1,5 @@
 Source: dvc
-Maintainer: Dmitry Petrov <dmitry@dataversioncontrol.com>
+Maintainer: Dmitry Petrov <dmitry@dvc.org>
 Section: python
 Priority: optional
 Build-Depends: dh-python, python3-setuptools, python3-all, debhelper (>= 9)

debian/copyright

@@ -1,10 +1,10 @@
 Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: DVC
-Upstream-Contact: Dmitry Petrov <dmitry@dataversioncontrol.com>
+Upstream-Contact: Dmitry Petrov <dmitry@dvc.org>
 Source: https://github.com/iterative/dvc
 
 Files: *
-Copyright: Dmitry Petrov <dmitry@dataversioncontrol.com>
+Copyright: Dmitry Petrov <dmitry@dvc.org>
 License: Apache 2.0
  On Debian systems, the full text of the Apache 2.0
  License can be found in the file

setup.py

@@ -133,7 +133,7 @@ setup(
     description="Git for data scientists - manage your code and data together",
     long_description=open("README.rst", "r").read(),
     author="Dmitry Petrov",
-    author_email="dmitry@iterative.ai",
+    author_email="dmitry@dvc.org",
     download_url="https://github.com/iterative/dvc",
     license="Apache License 2.0",
     install_requires=install_requires,