[gimp-macos-build] Update documentation, move notarization to the own step

[Alex Samorukov <asamorukov src gnome org>]

commit b1439468d77ea056823f1e43ad7c510de5673f1f
Author: Oleksii Samorukov <oleksii_samorukov mckinsey com>
Date:   Mon Nov 4 13:03:07 2019 +0100

    Update documentation, move notarization to the own step

 .circleci/config.yml | 5 +++++
 README.md            | 8 ++++++++
 2 files changed, 13 insertions(+)
---
diff --git a/.circleci/config.yml b/.circleci/config.yml
index 6c2725d..2e41a16 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -134,6 +134,11 @@ jobs:
               source ~/.profile
               cd ${HOME}/project/package
               jhbuild run ./build.sh
+        - run:
+            name:  Notarizing DMG package
+            command: |
+              cd ${HOME}/project/package
+              xcrun e --notarize-app --file "/tmp/artifacts/${DMGNAME}" -u "${notarization_login}" 
--primary-bundle-id -p "${notarization_password}"
         - store_artifacts:
             path: /tmp/artifacts
             destination: builds
diff --git a/README.md b/README.md
index a346aa3..c6af7f7 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,14 @@ I was able to get working builds in the VirtualBox VM, it works stable enough fo
   - Creating DMG package using [create-dmg](https://github.com/andreyvit/create-dmg) tool and signing it
 - Uploading DMG to the CircleCI build artifacts
 
+## Known bugs and limitations (merge requests are welcome!)
+
+- [XPM import/export will not work](https://gitlab.gnome.org/Infrastructure/gimp-macos-build/issues/6) due 
to missing libxpm.
+- No scanning support. Scanner support needs to be re-implemented using ImageCaptureCore
+framework. Probably could be a small Python plugin as [there is a 
module](https://pypi.org/project/pyobjc-framework-ImageCaptureCore/) for it.
+- Some of the system modifiers are not working correctly, e.g. `Command+H`, `Command+~`, etc.
+- Loading of the remote HTTP objects is not supported due to Glib limitations on macOS
+
 ## Branches
 
 - `master`: latest GIMP release