Remove other CI configuration

.github/workflows/build.yaml

@@ -1,6 +1,6 @@
 name: Build & Test
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   run-test:

.travis.yml

@@ -1,25 +0,0 @@
-language: swift
-
-osx_image: 
-- xcode10.3
-- xcode11.1
-
-env:
-- DESTINATION='platform=macOS' SWIFT_VERSION=5.0
-- DESTINATION='platform=iOS Simulator,name=iPhone 8' SWIFT_VERSION=5.0
-- DESTINATION='platform=tvOS Simulator,name=Apple TV' SWIFT_VERSION=5.0
-- DESTINATION='platform=macOS' SWIFT_VERSION=4.2
-- DESTINATION='platform=iOS Simulator,name=iPhone 8' SWIFT_VERSION=4.2
-- DESTINATION='platform=tvOS Simulator,name=Apple TV' SWIFT_VERSION=4.2
-- DESTINATION='platform=macOS' SWIFT_VERSION=4.0
-- DESTINATION='platform=iOS Simulator,name=iPhone 8' SWIFT_VERSION=4.0
-- DESTINATION='platform=tvOS Simulator,name=Apple TV' SWIFT_VERSION=4.0
-
-cache: bundler
-
-before_install:
-  - gem update --system
-  - gem install bundler
-
-script:
-  - bundle exec fastlane test_ci

codecov.yml

@@ -1,10 +0,0 @@
-comment:
-  layout: header, changes, diff
-coverage:
-  ignore:
-  - Pods
-  - Tests
-  - Demo
-  - Kingfisher-Demo
-  - KingfisherTests
-