ci: install pandoc

Had to change drone image to debian based one because pandoc is not
packaged up in alpine.

Author: mmlb

.drone.yml

@@ -15,7 +15,8 @@ pipeline:
       - pylama packet test setup.py
 
   test:
-    image: python:${PYTHON_VERSION}-alpine
+    image: python:${PYTHON_VERSION}
     commands:
+      - apt update -y && apt install -y pandoc
       - pip install tox
       - tox

.travis.yml

@@ -1,10 +1,15 @@
+addons:
+  apt:
+    packages:
+      - pandoc
 language: python
 python:
   - "2.7"
   - "3.3"
   - "3.4"
   - "3.5"
   - "3.6"
+sudo: false
 
 install: pip install tox
 script: tox