Removed Python 3.6 and updated deps

.github/workflows/tox.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [[3,6], [3,7], [3,8], [3,9]]
+        python-version: [[3,7], [3,8], [3,9]]
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:

docs/contents/changelog.rst

@@ -17,17 +17,28 @@ __ https://github.com/useblocks/libpdf/compare/v0.0.1...HEAD
     `0.0.2`__ - 2020-09-30
     ----------------------
 
-Fixed
+Added
 ~~~~~
 
-- Fixed catalog outline title resolve issue (`PR #10 <https://github.com/useblocks/libpdf/pull/10>`_)
+Changed
+~~~~~~~
 
-Added
-~~~~~
+- Updated downstream library dependencies
 
 - Added flag ``--no_annotations`` to exclude annotation extraction from the catalog to speed up extraction
   (`PR #15 <https://github.com/useblocks/libpdf/pull/15>`_)
 
+Removed
+~~~~~~~
+
+- libpdf has dropped support for Python 3.6, which reached end-of-life on 2021-12-23; this also fixes the Pillow 8
+  security vulnerabilities
+
+Fixed
+~~~~~
+
+- Fixed catalog outline title resolve issue (`PR #10 <https://github.com/useblocks/libpdf/pull/10>`_)
+
 __ https://github.com/useblocks/libpdf/releases/tag/v0.0.1
 
 `0.0.1`__ - 2020-06-30