remove travis ci file (#2967)

.travis.yml

@@ -1,62 +0,0 @@
-sudo: false
-language: c
-matrix:
-  include:
-  - os: osx
-    compiler: clang
-    env: PATH=./racket/bin:$PATH
-  - os: linux
-    compiler: clang
-    env: PATH=./racket/bin:$PATH TARGET="cs"
-  - os: linux
-    compiler: gcc
-    env: PATH=./racket/bin:$PATH
-  - os: linux
-    compiler: clang
-    env: PATH=./racket/bin:$PATH
-  - os: linux
-    compiler: gcc
-    env: PATH=./racket/bin:$PATH RACKET_CONFIGURE_ARGS="--disable-places --disable-futures
-      --disable-extflonum"
-  - os: linux
-    compiler: gcc
-    env: PATH=./racket/bin:$PATH RACKET_CONFIGURE_ARGS="--disable-jit"
-  - os: linux
-    compiler: gcc
-    env: PATH=./racket/bin:$PATH RACKET_CONFIGURE_ARGS="--disable-jit --disable-places
-      --disable-futures --disable-extflonum"
-before_script:
-- git config --global user.email "travis-test@racket-lang.org"
-- git config --global user.name "Travis Tester"
-script:
-- make $TARGET  \
-       CPUS="2"  \
-       PKGS="racket-test db-test unstable-flonum-lib net-test"  \
-       CONFIGURE_ARGS_qq="$RACKET_CONFIGURE_ARGS"  \
-       RACKETCS_SUFFIX="$RACKETCS_SUFFIX"
-- which racket
-- racket -v
-- raco test -l tests/racket/test
-- racket -l tests/racket/contract/all
-- raco test -l tests/json/json
-- raco test -l tests/file/main
-- raco test -l tests/net/head
-- raco test -l tests/net/uri-codec
-- raco test -l tests/net/url
-- raco test -l tests/net/url-port
-- raco test -l tests/net/encoders
-- raco test -l tests/openssl/basic
-- raco test -l tests/openssl/https
-- raco test -l tests/match/main
-- raco test -l tests/zo-path
-- raco test -l tests/xml/test
-- raco test -l tests/db/all-tests
-- raco test -c tests/stxparse
-notifications:
-  email:
-    recipients:
-    - samth@racket-lang.org
-    - robby@racket-lang.org
-    - mflatt@racket-lang.org
-    on_success: change
-  slack: racket:7tWt0B5oYB5RrjqbtbzbvY0Q