global: centralise Flask dependency management

* update travis.yml
* drop support for Python 2.7

.travis.yml

@@ -21,15 +21,16 @@ env:
   - REQUIREMENTS=devel
 
 python:
-  - "2.7"
-  - "3.5"
+  - "3.6"
+  - "3.7"
 
 matrix:
   fast_finish: true
   allow_failures:
     - env: REQUIREMENTS=devel
 
 before_install:
+  - "pip uninstall -y six"
   - "travis_retry pip install --upgrade pip setuptools py"
   - "travis_retry pip install twine wheel coveralls requirements-builder"
   - "requirements-builder --level=min -e all setup.py > .travis-lowest-requirements.txt"
@@ -52,7 +53,8 @@ deploy:
   password:
     secure: "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"
   distributions: "sdist bdist_wheel"
+  skip_existing: true
   on:
     tags: true
-    python: "2.7"
+    python: "3.6"
     condition: $REQUIREMENTS = release

requirements-devel.txt

@@ -6,3 +6,4 @@
 # Invenio is free software; you can redistribute it and/or modify it
 # under the terms of the MIT License; see LICENSE file for more details.
 #
+-e git+https://github.com/inveniosoftware/invenio-base.git#egg=invenio-base

setup.py

@@ -34,7 +34,7 @@
     ],
     'tests': tests_require,
     'sentry': [
-        'raven[flask]>=5.10.2,<6',
+        'raven[flask]>=6',
         'flask-celeryext>=0.2.2'],
     'sentry-sdk':
         ['sentry-sdk[flask]>=0.10.2']
@@ -49,8 +49,7 @@
 ]
 
 install_requires = [
-    'Flask>=0.11.1',
-    'six>=1.12.0',
+    'invenio-base>=1.2.2',
 ]
 
 packages = find_packages()