Update pypi package versions (requirements.txt)

tildes/requirements.txt

@@ -2,15 +2,15 @@ ago==0.0.92
 alembic==1.0.0
 amqpy==0.13.1
 appdirs==1.4.3
-argon2-cffi==18.1.0
+argon2-cffi==18.3.0
 astroid==1.5.3
-atomicwrites==1.1.5
+atomicwrites==1.2.0
 attrs==18.1.0
 backcall==0.1.0
 beautifulsoup4==4.6.3
 black==18.6b4
-bleach==2.1.3
-certifi==2018.4.16
+bleach==2.1.4
+certifi==2018.8.24
 cffi==1.11.5
 chardet==3.0.4
 click==6.7
@@ -33,7 +33,7 @@ marshmallow==2.15.4
 mccabe==0.6.1
 more-itertools==4.3.0
 mypy==0.620
-mypy-extensions==0.3.0
+mypy-extensions==0.4.1
 parso==0.3.1
 PasteDeploy==1.5.2
 pexpect==4.6.0
@@ -47,7 +47,7 @@ prompt-toolkit==1.0.15
 psycopg2==2.7.5
 ptyprocess==0.6.0
 publicsuffix2==2.20160818
-py==1.5.4
+py==1.6.0
 pycodestyle==2.4.0
 pycparser==2.18
 pydocstyle==2.1.1
@@ -65,7 +65,7 @@ pyramid-mako==1.0.2
 pyramid-session-redis==1.4.1
 pyramid-tm==2.2
 pyramid-webassets==0.9
-pytest==3.7.1
+pytest==3.7.3
 pytest-mock==1.10.0
 python-dateutil==2.7.3
 python-editor==1.0.3
@@ -78,9 +78,9 @@ simplegeneric==0.8.1
 simplejson==3.16.0
 six==1.11.0
 snowballstemmer==1.2.1
-SQLAlchemy==1.2.10
+SQLAlchemy==1.2.11
 SQLAlchemy-Utils==0.33.3
-stripe==2.4.0
+stripe==2.6.0
 testing.common.database==2.0.3
 testing.redis==1.1.1
 titlecase==0.12.0