[docs] Fix, read the docs requirements (#1288)

rtd_requirements.txt

@@ -1,18 +1,35 @@
 sphinxcontrib-blockdiag>=1.5.0
 sphinx-rtd-theme>=0.2.4
-colorama>=0.3
-click>=3.0
-Flask>=0.12,<2
-Flask-Babel>=0.11.1,<1
-Flask-Login>=0.3,<0.5
-Flask-OpenID>=1.2.5,<2
-Flask-SQLAlchemy>=2.3,<3
-Flask-WTF>=0.14.2,<1
-flask-marshmallow==0.9.0
-Flask-JWT-Extended>=3.18,<4
-marshmallow==2.18.0
-marshmallow-sqlalchemy==0.15.0
-prison==0.1.0
-apispec==1.1.1
+apispec[yaml]==1.1.1
+attrs==19.1.0             # via jsonschema
+babel==2.6.0              # via flask-babel
+click==7.0
+colorama==0.4.1
+defusedxml==0.5.0         # via python3-openid
+flask-babel==1.0.0
+flask-jwt-extended==3.18.0
+flask-login==0.4.1
+flask-openid==1.2.5
+flask-sqlalchemy==2.4.0
+flask-wtf==0.14.2
+flask==1.1.1
+itsdangerous==1.1.0       # via flask
+jinja2==2.10.1            # via flask, flask-babel
 jsonschema==3.0.1
-PyJWT>=1.7.1
+markupsafe==1.1.1         # via jinja2
+marshmallow-enum==1.4.1
+marshmallow-sqlalchemy==0.16.2
+marshmallow==2.18.0
+prison==0.1.2
+pyjwt==1.7.1
+pyrsistent==0.14.11       # via jsonschema
+python-dateutil==2.8.0
+python3-openid==3.1.0     # via flask-openid
+pytz==2018.9              # via babel, flask-babel
+pyyaml==5.1               # via apispec
+six==1.12.0               # via flask-jwt-extended, jsonschema, prison, pyrsistent, python-dateutil, sqlalchemy-utils
+sqlalchemy-utils==0.33.9
+sqlalchemy==1.3.1         # via flask-sqlalchemy, marshmallow-sqlalchemy, sqlalchemy-utils
+werkzeug==0.15.5          # via flask, flask-jwt-extended
+wtforms==2.2.1            # via flask-wtf
+