Update requirements

requirements.in

@@ -11,4 +11,5 @@ Flask-Migrate
 Flask-Script
 black
 pymysql
+pyyaml
 tatsu

requirements.txt

@@ -8,7 +8,7 @@ airbrake==2.1.2
 alembic==1.0.8            # via flask-migrate
 appdirs==1.4.3            # via black
 attrs==19.1.0             # via black
-black==19.3b0
+black==19.10b0
 blinker==1.4              # via flask-debugtoolbar
 certifi==2019.3.9         # via requests
 chardet==3.0.4            # via requests
@@ -30,15 +30,19 @@ jinja2==2.10.1            # via flask
 mako==1.0.8               # via alembic
 markupsafe==1.1.1         # via jinja2, mako
 oauthlib==2.1.0           # via flask-oauthlib, requests-oauthlib
+pathspec==0.7.0           # via black
 pymysql==0.9.3
 python-dateutil==2.8.0    # via alembic
 python-editor==1.0.4      # via alembic
-PyYaml==5.1.2
+pyyaml==5.3
+regex==2020.1.8           # via black
 requests-oauthlib==1.1.0  # via flask-oauthlib
 requests==2.21.0          # via airbrake, requests-oauthlib
 six==1.12.0               # via python-dateutil
 sqlalchemy==1.3.2         # via alembic, flask-sqlalchemy
+tatsu==4.4.0
 toml==0.10.0              # via black
+typed-ast==1.4.1          # via black
 urllib3==1.24.2           # via requests
 visitor==0.1.3            # via flask-bootstrap
 werkzeug==0.15.3          # via flask, flask-debugtoolbar