patch 8.2.2346: Codecov reports every little coverage drop

Problem:    Codecov reports every little coverage drop.
Solution:   Tolerate a 0.05% drop. Hide the appveyor config file. (Ozaki
            Kiichi, closes #7678)

.appveyor.yml

@@ -0,0 +1,34 @@
+version: "{build}"
+
+skip_tags: true
+
+environment:
+  matrix:
+    - FEATURE: HUGE
+# disabled
+#    - FEATURE: TINY
+#    - FEATURE: SMALL
+#    - FEATURE: NORMAL
+#    - FEATURE: BIG
+
+matrix:
+  fast_finish: true
+
+before_build:
+  # Use Windows SDK 7.1 (= MSVC 2010)
+  - '"C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin\SetEnv.cmd" /x64 /release'
+  - 'set INCLUDE=%INCLUDE%C:\Program Files (x86)\Windows Kits\8.1\Include\um'
+
+build_script:
+  - ci/appveyor.bat
+
+test_script:
+  - cd src/testdir
+    # Testing with MSVC gvim
+  - path C:\Python35-x64;%PATH%
+  - nmake -f Make_dos.mak VIMPROG=..\gvim
+  - nmake -f Make_dos.mak clean
+    # Testing with MSVC console version
+  - nmake -f Make_dos.mak VIMPROG=..\vim
+
+# vim: sw=2 sts=2 et ts=8 sr