NO-JIRA: update build status badges after branch renamed to main

Author: gemmellr

INSTALL.txt

@@ -165,7 +165,7 @@ Qpid test suite.
 
 3. Building a Repository Working Copy
 =====================================
-Developers interested in building master, e.g to test ahead of release, can
+Developers interested in building the main branch, e.g to test ahead of release, can
 get the source code from the git repository using:
 
  # git clone https://gitbox.apache.org/repos/asf/qpid-cpp.git

README.md

@@ -21,7 +21,7 @@ under the License.
 
 # Qpid C++
 
-[![Linux build status](https://builds.apache.org/buildStatus/icon?job=Qpid-cpp-trunk-test)](https://builds.apache.org/blue/organizations/jenkins/Qpid-cpp-trunk-test/activity) [![Windows build status](https://ci.appveyor.com/api/projects/status/wma611lkq1fcyo18?svg=true)](https://ci.appveyor.com/project/ApacheSoftwareFoundation/qpid-cpp/branch/master)
+[![Linux build status](https://builds.apache.org/buildStatus/icon?job=Qpid/Qpid-CPP-Test)](https://builds.apache.org/blue/organizations/jenkins/Qpid%2FQpid-CPP-Test/activity) [![Windows build status](https://ci.appveyor.com/api/projects/status/wma611lkq1fcyo18?svg=true)](https://ci.appveyor.com/project/ApacheSoftwareFoundation/qpid-cpp/branch/main)
 
 ## Introduction