Add a changelog

Signed-off-by: mulhern <amulhern@redhat.com>

CHANGES.txt

@@ -0,0 +1,26 @@
+dbus-signature-pyparsing 0.4
+============================
+
+Recommended Python interpreter: 3.7.9
+Recommended tox version: 3.13.2
+Python auto-formatter: black (19.10b0)
+Python import sorter: isort (4.3.21)
+YAML linter: yamllint (1.23.0)
+
+- Split tests into two kinds, deterministic and Hypothesis based:
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/18
+
+- Tidies and Maintenance:
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/21
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/17
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/16
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/13
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/12
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/11
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/10
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/9
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/8
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/7
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/6
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/4
+  https://github.com/stratis-storage/dbus-signature-pyparsing/pull/3