Remove Travis/Appvayor CI configuration

.travis.yml

@@ -1,29 +0,0 @@
-dist: bionic
-language: rust
-
-branches:
-  except:
-    - stable
-
-matrix:
-  fast_finish: true
-  include:
-    - os: linux
-      rust: stable
-
-    - os: linux
-      rust: nightly
-
-    # minimum supported version
-    - os: linux
-      rust: 1.42.0
-
-    - os: osx
-      rust: stable
-
-env:
-  global:
-    - RUST_BACKTRACE=1
-
-script:
-  - bash ./scripts/travis.sh

appveyor.yml

@@ -1,28 +0,0 @@
-platform:
-  - x64
-
-environment:
-  matrix:
-    - RUST_VERSION: stable
-      PLATFORM_TARGET: x86_64
-      PLATFORM_VS: x64
-
-install:
-  # Install Rust.
-  - appveyor-retry appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
-  - rustup-init.exe -yv --default-toolchain %RUST_VERSION% --default-host x86_64-pc-windows-msvc
-  - set PATH=%USERPROFILE%\.cargo\bin;%PATH%
-  - rustc -vV
-  - cargo -vV
-
-build_script:
-  - cargo build --all-features -p sailfish -p sailfish-compiler
-
-test_script:
-  - cargo test --all-features -p sailfish -p sailfish-compiler -p integration-tests
-
-notifications:
-  - provider: Email
-    on_build_success: false
-    on_build_failure: false
-    on_build_status_changed: false