AVRO-2847: Deactivate windows OS test on Travis (#939)

diff --git a/.travis.yml b/.travis.yml
index 9df38fb..4cd0cc4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -32,8 +32,9 @@
     env:
       JAVA=11
 
-  - os: windows
-    language: bash
+# TODO(AVRO-2847): Travis Windows/C# build is sometimes flaky
+#  - os: windows
+#    language: bash
 
 before_install: "if [ -x ./.travis/before_install.sh   ] ; then ./.travis/before_install.sh ; fi"
 install:        "if [ -x ./.travis/install.sh          ] ; then ./.travis/install.sh        ; fi"