update appveyor to go 1.11, add support for code coverage generation in tests

.travis.yml

@@ -25,3 +25,7 @@ script:
   - ./runtests test
   - ./runtests gfmrun
   - ./runtests toc
+
+after_success:
+  - ./coverage.sh
+  - bash <(curl -s https://codecov.io/bash)

appveyor.yml

@@ -8,7 +8,7 @@ clone_folder: c:\gopath\src\github.com\urfave\cli
 
 environment:
   GOPATH: C:\gopath
-  GOVERSION: 1.8.x
+  GOVERSION: 1.11.x
   PYTHON: C:\Python36-x64
   PYTHON_VERSION: 3.6.x
   PYTHON_ARCH: 64

coverage.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+set -e
+echo "" > coverage.txt
+
+for f in $(ls *.coverprofile); do
+    cat $f >> coverage.txt
+    rm $f
+done

runtests

@@ -34,10 +34,6 @@ def main(sysargs=sys.argv[:]):
 
 
 def _test():
-    if check_output('go version'.split()).split()[2] < 'go1.2':
-        _run('go test -v .')
-        return
-
     coverprofiles = []
     for subpackage in ['', 'altsrc']:
         coverprofile = 'cli.coverprofile'