Fix black complaint

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

pungi/phases/gather/__init__.py

@@ -541,7 +541,8 @@ def write_packages(compose, arch, variant, pkg_map, path_prefix):
 
 
 def trim_packages(compose, arch, variant, pkg_map, parent_pkgs=None, remove_pkgs=None):
-    """Remove parent variant's packages from pkg_map <-- it gets modified in this function
+    """Remove parent variant's packages from pkg_map <-- it gets modified in
+    this function
 
     There are three cases where changes may happen:
 

tests/test_patch_iso.py

@@ -61,7 +61,7 @@ class EqualsAny(object):
         return True
 
     def __repr__(self):
-        return u"ANYTHING"
+        return "ANYTHING"
 
 
 ANYTHING = EqualsAny()