build: update to use go1.11 for the build

Also select latest patch release for go using 1.yy.x feature in travis

.appveyor.yml

@@ -15,6 +15,8 @@ environment:
   RCLONE_CONFIG_PASS:
     secure: HbzxSy9zQ8NYWN9NNPf6ALQO9Q0mwRNqwehsLcOEHy0=
 
+stack: go 1.11
+
 install:
 - choco install winfsp -y
 - choco install zip -y

.travis.yml

@@ -4,11 +4,11 @@ dist: trusty
 os:
 - linux
 go:
-- 1.7.6
-- 1.8.7
-- 1.9.3
-- "1.10.1"
-- "1.11rc1"
+- 1.7.x
+- 1.8.x
+- 1.9.x
+- 1.10.x
+- 1.11.x
 - tip
 before_install:
 - if [[ $TRAVIS_OS_NAME == linux ]]; then sudo modprobe fuse ; sudo chmod 666 /dev/fuse ; sudo chown root:$USER /etc/fuse.conf ; fi
@@ -39,7 +39,7 @@ matrix:
   - go: tip
   include:
   - os: osx
-    go: "1.11rc1"
+    go: 1.11.x
     env: GOTAGS=""
 deploy:
   provider: script
@@ -47,5 +47,5 @@ deploy:
   skip_cleanup: true
   on:
     all_branches: true
-    go: "1.11rc1"
+    go: 1.11.x
     condition: $TRAVIS_PULL_REQUEST == false