[gimp-macos-build] Update gimp

[Alex Samorukov <asamorukov src gnome org>]

commit 00b6043fb623e1130e1b1eb4ee794c5567ea7ef8
Author: Oleksii Samorukov <oleksii_samorukov mckinsey com>
Date:   Sat Jun 13 23:35:23 2020 +0200

    Update gimp

 .circleci/config.yml | 4 ++--
 ChangeLog.md         | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/.circleci/config.yml b/.circleci/config.yml
index 0d1b63b..8089107 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -57,7 +57,7 @@ jobs:
         # we can try to make it automatically depended on the corresponding modules
         - restore_cache:
             keys:
-              - gimp-2.10.18-v1
+              - gimp-2.10.20-v1
               - webkit-v19
               - gimp-deps-v8
               - bootstrap-v18
@@ -114,7 +114,7 @@ jobs:
         - save_cache:
             paths:
               - ~/gtk
-            key: gimp-2.10.18-v1
+            key: gimp-2.10.20-v1
         - run:
             name: Importing signing certificate
             command: |
diff --git a/ChangeLog.md b/ChangeLog.md
index 4e5b3d2..5a9132c 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,4 +1,5 @@
 ## macOS specific changes
+### gimp-2.10.20-x86_64.dmg
 
 ### gimp-2.10.18-x86_64.dmg