Update .travis.yml

Change docker image namespace

.travis.yml

@@ -7,14 +7,14 @@ services:
 before_install:
 - echo "Before install"
 before_script:
-- docker pull overv/openstreetmap-tile-server || true
+- docker pull fsievers/openstreetmap-tile-server || true
 script:
-- docker build --pull --cache-from overv/openstreetmap-tile-server --tag overv/openstreetmap-tile-server .
+- docker build --pull --cache-from fsievers/openstreetmap-tile-server --tag fsievers/openstreetmap-tile-server .
 - docker volume create openstreetmap-data
-- docker run --rm -v openstreetmap-data:/var/lib/postgresql/12/main overv/openstreetmap-tile-server import
-- docker run --rm -v openstreetmap-data:/var/lib/postgresql/12/main -p 8080:80 -d overv/openstreetmap-tile-server run
+- docker run --rm -v openstreetmap-data:/var/lib/postgresql/12/main fsievers/openstreetmap-tile-server import
+- docker run --rm -v openstreetmap-data:/var/lib/postgresql/12/main -p 8080:80 -d fsievers/openstreetmap-tile-server run
 - sleep 30
-- make DOCKER_IMAGE=overv/openstreetmap-tile-server stop
+- make DOCKER_IMAGE=fsievers/openstreetmap-tile-server stop
 after_script:
 - docker images
 after_success: