Fix tests for latest Click (7.1.1)

requirements.txt

@@ -1,6 +1,6 @@
 bumpversion
 typing; python_version<"3.5"
-click==7.0
+click
 flake8>=2.2.3
 ipython
 mock

tests/test_cli.py

@@ -20,7 +20,7 @@ def test_list_non_existent_file(cli):
     result = cli.invoke(dotenv_cli, ['--file', 'nx_file', 'list'])
 
     assert result.exit_code == 2, result.output
-    assert 'Invalid value for "-f"' in result.output
+    assert "Invalid value for '-f'" in result.output
 
 
 def test_list_no_file(cli):
@@ -48,7 +48,7 @@ def test_get_no_file(cli):
     result = cli.invoke(dotenv_cli, ['--file', 'nx_file', 'get', 'a'])
 
     assert result.exit_code == 2
-    assert 'Invalid value for "-f"' in result.output
+    assert "Invalid value for '-f'" in result.output
 
 
 def test_unset_existing_value(cli, dotenv_file):
@@ -97,7 +97,7 @@ def test_set_no_file(cli):
     result = cli.invoke(dotenv_cli, ["--file", "nx_file", "set"])
 
     assert result.exit_code == 2
-    assert 'Invalid value for "-f"' in result.output
+    assert "Invalid value for '-f'" in result.output
 
 
 def test_get_default_path(tmp_path):
@@ -145,14 +145,14 @@ def test_run_without_cmd(cli):
     result = cli.invoke(dotenv_cli, ['run'])
 
     assert result.exit_code == 2
-    assert 'Invalid value for "-f"' in result.output
+    assert "Invalid value for '-f'" in result.output
 
 
 def test_run_with_invalid_cmd(cli):
     result = cli.invoke(dotenv_cli, ['run', 'i_do_not_exist'])
 
     assert result.exit_code == 2
-    assert 'Invalid value for "-f"' in result.output
+    assert "Invalid value for '-f'" in result.output
 
 
 def test_run_with_version(cli):

tox.ini

@@ -7,7 +7,7 @@ deps =
   pytest
   coverage
   sh
-  click==7.0
+  click
   py{27,py}: ipython<6.0.0
   py34{,-no-typing}: ipython<7.0.0
   py{35,36,37,38,py3}: ipython