CLN: Remove travis build (pandas-dev#41738)

Author: datapythonista

.travis.yml

@@ -63,29 +63,6 @@ conda update -n base conda
 echo "conda info -a"
 conda info -a
 
-echo
-echo "set the compiler cache to work"
-if [ -z "$NOCACHE" ] && [ "${TRAVIS_OS_NAME}" == "linux" ]; then
-    echo "Using ccache"
-    export PATH=/usr/lib/ccache:/usr/lib64/ccache:$PATH
-    GCC=$(which gcc)
-    echo "gcc: $GCC"
-    CCACHE=$(which ccache)
-    echo "ccache: $CCACHE"
-    export CC='ccache gcc'
-elif [ -z "$NOCACHE" ] && [ "${TRAVIS_OS_NAME}" == "osx" ]; then
-    echo "Install ccache"
-    brew install ccache > /dev/null 2>&1
-    echo "Using ccache"
-    export PATH=/usr/local/opt/ccache/libexec:$PATH
-    gcc=$(which gcc)
-    echo "gcc: $gcc"
-    CCACHE=$(which ccache)
-    echo "ccache: $CCACHE"
-else
-    echo "Not using ccache"
-fi
-
 echo "source deactivate"
 source deactivate