updated travis.yml

.travis.yml

@@ -1,8 +1,12 @@
 language: python
+dist: xenial
+sudo: false
 
 python:
   - 2.7
+  - 3.6
   - 3.7
+  - 3.8
 
 env:
   - DJANGO_VERSION=1.7
@@ -13,22 +17,6 @@ env:
   - DJANGO_VERSION=2.0
   - DJANGO_VERSION=2.1
 
-matrix:
-  exclude:
-    - python: 3.6
-      env: DJANGO=1.7
-    - python: 3.6
-      env: DJANGO=1.8
-    - python: 3.6
-      env: DJANGO=1.9
-    - python: 3.6
-      env: DJANGO=1.10
-    - python: 3.6
-      env: DJANGO=1.11
-    - python: 3.6
-      env: DJANGO=2.0
-    - python: 3.6
-      env: DJANGO=2.1
 cache:
   directories:
   - "$HOME/virtualenv"
@@ -43,9 +31,16 @@ after_success:
   - coveralls
 
 addons:
-  postgresql: 9.6
+  postgresql: "9.5"
   apt:
     packages:
-    - postgresql-9.6-postgis-2.4
+    - postgresql-9.5-postgis-2.4
+    - binutils
+    - libproj-dev
+    - python3-gdal
+    - libgeos-dev
+    - libyaml-dev
+    - libgnutls28-dev
+
 before_script:
   - psql -U postgres -c "create extension postgis"