fix wine build dir references

follow-up 8e32f49469

.travis.yml

@@ -37,7 +37,7 @@ jobs:
       services:
         - docker
       install:
-        - sudo docker build --no-cache -t electrum-wine-builder-img ./contrib/build-wine/docker/
+        - sudo docker build --no-cache -t electrum-wine-builder-img ./contrib/build-wine/
       script:
         - sudo docker run --name electrum-wine-builder-cont -v $PWD:/opt/wine64/drive_c/electrum --rm --workdir /opt/wine64/drive_c/electrum/contrib/build-wine electrum-wine-builder-img ./build.sh
       after_success: true

README.rst

@@ -98,7 +98,7 @@ See :code:`contrib/osx/README.md`.
 Windows
 -------
 
-See :code:`contrib/build-wine/docker/README.md`.
+See :code:`contrib/build-wine/README.md`.
 
 
 Android