atualiza versão lib comunicação postgres

docs/instalacao31.rst

@@ -25,7 +25,7 @@ Instalar as seguintes dependências do sistema::
 ::
 
     sudo apt-get install git python3-dev libpq-dev graphviz-dev graphviz \
-    pkg-config postgresql postgresql-contrib pgadmin3 python-psycopg2 \
+    pkg-config postgresql postgresql-contrib pgadmin3 python3-psycopg2 \
     software-properties-common build-essential libxml2-dev libjpeg-dev \
     libmysqlclient-dev libssl-dev libffi-dev libxslt1-dev python3-setuptools \
     python3-pip poppler-utils antiword default-jre python3-venv

requirements/requirements.txt

@@ -17,7 +17,7 @@ django-webpack-loader==0.6.0
 drf-yasg==1.13.0
 easy-thumbnails==2.5
 python-decouple==3.1
-psycopg2-binary==2.7.6.1
+psycopg2-binary==2.8.6
 pyyaml==5.3.1
 pytz==2019.3
 python-magic==0.4.15