Disable Travi-ci integration

[skip ci]
Currently we use it only to generate Qt5 AppImages for Linux
and we are about to deprecate Qt5 support.

INSTALL-MAC

@@ -96,7 +96,7 @@ $ git checkout V3.7
 $ ls
 
 The following walkthrough is based on latest master, if you want to build v3.7 please
-see the travis scripts in the repository.
+see the AppVeyor scripts in the repository.
 
 1.5 Install HomeBrew
 --------------------

README.md

@@ -40,8 +40,6 @@ INSTALL-MAC     For building on Apple MacOS
 
 Windows/macOS/Linux on AppVeyor: [![Build status](https://ci.appveyor.com/api/projects/status/i6dwn4m8oyu52ihi?svg=true)](https://ci.appveyor.com/project/Joern-R/goldencheetah-knhd8)
 
-Linux on Travis-ci: [![Build Status](https://app.travis-ci.com/GoldenCheetah/GoldenCheetah.svg?branch=master)](https://app.travis-ci.com/GoldenCheetah/GoldenCheetah)
-
 Official release builds, snapshots and development builds are all available from http://www.goldencheetah.org
 
 ## NOTIO Fork

src/Core/Secrets.h

@@ -25,10 +25,10 @@
 // not made public. If you want to build with these services enabled
 // you will need to request a token from the provider and add a line
 // to your gcconfig.pri file off the form:
-//      DEFINES += GC_TWITTER_CONSUMER_SECRET="xxxxxxx"
+//      DEFINES += GC_STRAVA_CLIENT_SECRET="__XXXX_SECRET__"
 //
-// This file is modified by the travis build scripts to replace the
-// __XXXX_SECRET__ token with the secret gem held within the travis
+// This file is modified by the AppVeyor build scripts to replace the
+// __XXXX_SECRET__ token with the secret gem held within the AppVeyor
 // build environment.
 //
 // ********* DO NOT MODIFY THIS FILE EXCEPT TO ADD NEW ************