Update pypi package versions (requirements.txt)

There are a few significant updates in here (Pyramid 1.10, redis 3.0,
etc.) but they don't have any major effects, so this should all be safe
and I can do some additional updates in follow-up commits.

tildes/requirements.txt

@@ -1,5 +1,5 @@
 ago==0.0.93
-alembic==1.0.0
+alembic==1.0.3
 amqpy==0.13.1
 appdirs==1.4.3
 argon2-cffi==18.3.0
@@ -14,97 +14,94 @@ certifi==2018.10.15
 cffi==1.11.5
 chardet==3.0.4
 Click==7.0
-cornice==3.4.1
+cornice==3.4.2
 decorator==4.3.0
 dodgy==0.1.9
-flake8==3.5.0
-flake8-polyfill==1.0.2
 freezegun==0.3.11
 gunicorn==19.9.0
 html5lib==1.0.1
-hupper==1.3.1
+hupper==1.4.1
 idna==2.7
-ipython==7.0.1
+ipython==7.1.1
 ipython-genutils==0.2.0
 isort==4.3.4
 jedi==0.13.1
 Jinja2==2.10
 lazy-object-proxy==1.3.1
 Mako==1.0.7
-MarkupSafe==1.0
-marshmallow==2.16.0
+MarkupSafe==1.1.0
+marshmallow==2.16.3
 mccabe==0.6.1
 more-itertools==4.3.0
 mypy==0.641
 mypy-extensions==0.4.1
 parso==0.3.1
 PasteDeploy==1.5.2
-pep8-naming==0.7.0
+pep8-naming==0.4.1
 pexpect==4.6.0
 pickleshare==0.7.5
 Pillow==5.3.0
 plaster==1.0
 plaster-pastedeploy==0.6
-pluggy==0.7.1
+pluggy==0.8.0
 prometheus-client==0.4.2
-prompt-toolkit==2.0.6
-prospector==1.1.3
-psycopg2==2.7.5
+prompt-toolkit==2.0.7
+prospector==1.1.5
+psycopg2==2.7.6.1
 ptyprocess==0.6.0
 publicsuffix2==2.20160818
 py==1.7.0
-pycodestyle==2.3.1
+pycodestyle==2.4.0
 pycparser==2.19
 pydocstyle==3.0.0
 pyflakes==1.6.0
 Pygments==2.2.0
 pylint==2.1.1
 pylint-plugin-utils==0.4
-pyotp==2.2.6
-pyramid==1.9.2
+pyotp==2.2.7
+pyramid==1.10.1
 pyramid-debugtoolbar==4.5
 pyramid-ipython==0.2
 pyramid-jinja2==2.7
 pyramid-mako==1.0.2
 pyramid-session-redis==1.4.1
-pyramid-tm==2.2
-pyramid-webassets==0.9
-pytest==3.8.2
+pyramid-tm==2.2.1
+pyramid-webassets==0.10
+pytest==4.0.0
 pytest-mock==1.10.0
-python-dateutil==2.7.3
+python-dateutil==2.7.5
 python-editor==1.0.3
 PyYAML==3.13
 qrcode==6.0
-redis==2.10.6
+redis==3.0.1
 repoze.lru==0.7
-requests==2.19.1
+requests==2.20.1
 requirements-detector==0.6
 setoptconf==0.2.0
-simplegeneric==0.8.1
 simplejson==3.16.0
 six==1.11.0
 snowballstemmer==1.2.1
-SQLAlchemy==1.2.12
-SQLAlchemy-Utils==0.33.6
-stripe==2.10.1
+SQLAlchemy==1.2.14
+SQLAlchemy-Utils==0.33.8
+stripe==2.12.0
 testing.common.database==2.0.3
 testing.redis==1.1.1
 titlecase==0.12.0
 toml==0.10.0
 traitlets==4.3.2
-transaction==2.2.1
+transaction==2.4.0
 translationstring==1.3
 typed-ast==1.1.0
-urllib3==1.23
+urllib3==1.24.1
 venusian==1.1.0
 waitress==1.1.0
 wcwidth==0.1.7
-webargs==4.1.0
+webargs==4.1.2
 webassets==0.12.1
 webencodings==0.5.1
-WebOb==1.8.3
+WebOb==1.8.4
 WebTest==2.0.32
 wrapt==1.10.11
 zope.deprecation==4.3.0
-zope.interface==4.5.0
+zope.interface==4.6.0
 zope.sqlalchemy==1.0