Now use towncrier for changelog management

CHANGELOG

 Changelog
 =========
 
-0.6 (Unreleased)
-----------------
-
-- Always use username in sidebar (#89)
-- Fixed broken import because of missing transaction
+.. towncrier
 
 
 0.5.2 (2018-02-26)

changes/changelog.d/89.bugfix

+Always use username in sidebar (#89)

changes/changelog.d/changelog.misc

+Switched to towncrier for changelog management and compilation

changes/changelog.d/transaction-import.bugfix

+Fixed broken import because of missing transaction

changes/template.rst

+{% for section, _ in sections.items() %}
+{% if sections[section] %}
+{% for category, val in definitions.items() if category in sections[section]%}
+{{ definitions[category]['name'] }}:
+
+{% if definitions[category]['showcontent'] %}
+{% for text in sections[section][category].keys()|sort() %}
+- {{ text }}
+{% endfor %}
+
+{% else %}
+- {{ sections[section][category]['']|join(', ') }}
+
+{% endif %}
+{% if sections[section][category]|length == 0 %}
+No significant changes.
+
+{% else %}
+{% endif %}
+
+{% endfor %}
+{% else %}
+No significant changes.
+
+
+{% endif %}
+{% endfor %}

pyproject.toml

+[tool.towncrier]
+    package = "changes"
+    package_dir = ""
+    filename = "CHANGELOG"
+    directory = "changes/changelog.d/"
+    start_string = ".. towncrier\n"
+    template = "changes/template.rst"
+    issue_format = ""
+    title_format = "{version} (unreleased)"
+    underlines = "-"
+
+    [[tool.towncrier.section]]
+        path = ""
+
+    [[tool.towncrier.type]]
+        directory = "feature"
+        name = "Features"
+        showcontent = true
+
+    [[tool.towncrier.type]]
+        directory = "bugfix"
+        name = "Bugfixes"
+        showcontent = true
+
+    [[tool.towncrier.type]]
+        directory = "doc"
+        name = "Documentation"
+        showcontent = true
+
+    [[tool.towncrier.type]]
+        directory = "misc"
+        name = "Other"
+        showcontent = true