Fix appveyor.

Comment travis arm64 because of non-related failure.
Remove sudo requirement from x86 travis.

.appveyor.yml

@@ -17,6 +17,8 @@ platform:
 clone_depth: 10
 
 install:
+  - git submodule update --init --recursive
+
   # use the newest versions documented here: https://www.appveyor.com/docs/windows-images-software/#mingw-msys-cygwin
   - IF "%PLATFORM%" == "x86" SET PATH=C:\mingw-w64\i686-6.3.0-posix-dwarf-rt_v5-rev1\mingw32\bin;%PATH%
   - IF "%PLATFORM%" == "x64" SET PATH=C:\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin;%PATH%

.travis.yml

@@ -13,10 +13,9 @@ matrix:
   include:
     - os: linux
       arch: amd64
-      sudo: required
-    - os: linux
-      arch: arm64
-      sudo: required
+    # - os: linux
+    #   arch: arm64
+    #   sudo: required
     - os: osx
 
 install:
@@ -30,4 +29,3 @@ install:
 script:
   - nimble install -y
   - nimble test
-