Use 'python3 -m sphinx' instead of sphinx-build for building docs

debian/changelog

@@ -4,6 +4,7 @@ python-pymysql (0.9.2-1) UNRELEASED; urgency=medium
   * Convert git repository from git-dpm to gbp layout
   * Add python{,3}-cryptography into B-D
   * Bump standards version to 4.2.0 (no changes)
+  * Use 'python3 -m sphinx' instead of sphinx-build for building docs
 
  -- Ondřej Nový <onovy@debian.org>  Wed, 08 Aug 2018 09:12:27 +0200
 

debian/rules

@@ -7,7 +7,7 @@ export PYBUILD_NAME=pymysql
 
 override_dh_sphinxdoc:
 ifeq (,$(findstring nodocs, $(DEB_BUILD_OPTIONS)))
-	PYTHONPATH=. sphinx-build -b html docs/source $(CURDIR)/debian/python-pymysql-doc/usr/share/doc/python-pymysql-doc/html
+	PYTHONPATH=. python3 -m sphinx -b html docs/source $(CURDIR)/debian/python-pymysql-doc/usr/share/doc/python-pymysql-doc/html
 	dh_sphinxdoc -O--buildsystem=python_distutils
 endif