Merge pull request #1378 from Angristan/update-docker-alpine

Update Docker image to Alpine 3.8

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.7
+FROM alpine:3.8
 MAINTAINER searx <https://github.com/asciimoo/searx>
 LABEL description "A privacy-respecting, hackable metasearch engine."