Upgrade build to Alpine 3.10.

.drone.yml

@@ -1,30 +1,30 @@
 ---
 kind: pipeline
-name: python-3-5-alpine-3-9
+name: python-3-5-alpine-3-10
 
 steps:
 - name: build
-  image: python:3.5-alpine3.9
+  image: python:3.5-alpine3.10
   pull: always
   commands:
     - scripts/run-tests
 ---
 kind: pipeline
-name: python-3-6-alpine-3-9
+name: python-3-6-alpine-3-10
 
 steps:
 - name: build
-  image: python:3.6-alpine3.9
+  image: python:3.6-alpine3.10
   pull: always
   commands:
     - scripts/run-tests
 ---
 kind: pipeline
-name: python-3-7-alpine-3-9
+name: python-3-7-alpine-3-10
 
 steps:
 - name: build
-  image: python:3.7-alpine3.9
+  image: python:3.7-alpine3.10
   pull: always
   commands:
     - scripts/run-tests