Update dependencies.

.scrutinizer.yml

@@ -2,17 +2,10 @@ filter:
   excluded_paths:
     - test/*
 
-before_commands:
-  - sudo pip3 install cleo==0.6.8
-  - sudo pip3 install coverage
-  - sudo pip3 install PyStratum-Backend
-
 build:
   dependencies:
     before:
-      - pip3 install cleo==0.6.8
-      - pip3 install coverage
-      - pip3 install PyStratum-Backend
+      - pip install -r requirements.txt
 
   nodes:
     analysis:

.travis.yml

@@ -4,9 +4,7 @@ python:
   - '3.8'
 
 install:
-  - pip install cleo==0.6.8
-  - pip install coverage
-  - pip install PyStratum-Backend
+  - pip install -r requirements.txt
 
 script:
   - python -m unittest discover -s test -p *Test.py

requirements.txt

@@ -0,0 +1,6 @@
+# Must be aligned with setup.py.
+cleo==0.6.8
+PyStratum-Backend<2, >=1.0.2
+
+# For development only.
+coverage<6, >=5.3

setup.py

@@ -42,7 +42,8 @@
 
     packages=find_packages(exclude=['build', 'test']),
 
-    install_requires=['cleo==0.6.8'],
+    install_requires=['cleo==0.6.8',
+                      'PyStratum-Backend<2, >=1.0.2'],
 
     entry_points={
         'console_scripts': [