fix: updated gitlab-ci script

.gitlab-ci.yml

-image: python:2.7
+image: python:3.6
 
 
 variables:
@@ -8,8 +8,8 @@ variables:
 
 before_script:
   - apt-get update && apt-get install -y --allow-unauthenticated libsasl2-dev libssl-dev locales locales-all
-  - pip install -r requirements.txt --default-timeout=180
-  - pip install -r requirements-dev.txt --default-timeout=180
+  - pip install -r requirements.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/
+  - pip install -r requirements-dev.txt --default-timeout=180 -i https://pypi.lcsb.uni.lu/simple/
 
 test:
     services: