Remove Travis CI and AppVeyor build badges

.travis.yml

-language: cpp
-
-os:
-  - linux
-  - osx
-
-dist: trusty
-osx_image: xcode8
-sudo: false
-
-compiler:
-  - clang
-  - gcc
-
-env:
-  - REACTOR_BACKEND=Subzero
-  - REACTOR_BACKEND=LLVM SWIFTSHADER_LLVM_VERSION=3
-  - REACTOR_BACKEND=LLVM SWIFTSHADER_LLVM_VERSION=7
-
-script:
-  - $CXX --version
-  - mkdir -p build && cd build
-  - cmake -DREACTOR_BACKEND=$REACTOR_BACKEND ..
-  - make -j2
-  - ./gles-unittests
-  - ./ReactorUnitTests
-
-notifications:
-  email:
-    recipients:
-      - swiftshader-team@google.com
-    on_success: never
-    on_failure: always
-
-deploy:
-  provider: gcs
-  access_key_id: GOOGUX6FX5STNWQ5LHZ5
-  secret_access_key:
-    secure: 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
-  bucket: swiftshader-binaries
-  skip_cleanup: true
-  acl: public-read
-  upload-dir: OpenGL_ES/Latest
-  local-dir: $TRAVIS_BUILD_DIR/out

README.md

 # SwiftShader
 
-[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0) [![Build Status](https://travis-ci.org/google/swiftshader.svg?branch=master)](https://travis-ci.org/google/swiftshader) [![Build status](https://ci.appveyor.com/api/projects/status/yrmyvb34j22jg1uj?svg=true)](https://ci.appveyor.com/project/c0d1f1ed/swiftshader)
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 
 Introduction
 ------------