Merge ~tshinn/snap-store-proxy-charm:max_line_length_88 into snap-store-proxy-charm:main

[Tong Shinn]

Set max line length to 88 (Store team convention).

[John Paraskevopoulos (quantifics)]

review: Approve

diff --git a/setup.cfg b/setup.cfg
index c59d487..dbd2531 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,5 +1,5 @@
 [flake8]
-max-line-length = 99
+max-line-length = 88
 select: E,W,F,C,N
 exclude:
   venv
diff --git a/src/exceptions.py b/src/exceptions.py
index 661a7c4..cda33de 100644
--- a/src/exceptions.py
+++ b/src/exceptions.py
@@ -11,7 +11,8 @@ class ConfigException(Exception):
 class UnknownTypeException(ConfigException):
     def __init__(self, message):
         super().__init__(
-            f"Unknown config type defined '{message}', don't know how to validate input."
+            f"Unknown config type defined '{message}', "
+            "don't know how to validate input."
         )
 
 
diff --git a/tests/test_charm.py b/tests/test_charm.py
index 43d6364..7c0ccd6 100644
--- a/tests/test_charm.py
+++ b/tests/test_charm.py
@@ -54,7 +54,7 @@ class TestConfig(CharmTest):
             self.harness.update_config()
 
         for key, value in self.config_defaults.items():
-            # Accept the default value of None, for items that don't have a default value
+            # Accept the default value of None for items that don't have a default value
             assert getattr(self.harness.charm._stored, key, None) == value
 
     def test_on_config_changed(self):
@@ -529,7 +529,8 @@ class TestInstallation(CharmTest):
         assert not hasattr(self.harness.charm._stored, "snap_md5")
 
     def test_install_from_store_update(self):
-        # In case of an update (repeated call) nothing should happen if installed from store
+        # In case of an update (repeated call) nothing should happen if installed from
+        # store
         self.harness.charm._stored.snap_install_source = "store"
 
         with patch("charm.install_from_the_charmstore") as patched_install: