Update documentation of report location

[skip ci]

Author: per1234

README.md

@@ -111,7 +111,7 @@ Pass some parameters from .travis.yml to the script. `build_sketch` will echo th
 - Parameter: **endIDEversion** - The end (inclusive) of a range of versions of the Arduino IDE to use to verify the sketch.
 
 ##### `display_report`
-Echo a tab separated report of all verification results to the log. The report is located at `$HOME/report.txt`. Note that Travis CI runs each build of the job in a separate virtual machine so if you have multiple jobs you will have multiple reports. The only way I have found to generate a single report for all tests is to run them as a single job. This means not setting multiple matrix environment variables in the `env` array. See https://docs.travis-ci.com/user/environment-variables. The report consists of:
+Echo a tab separated report of all verification results to the log. The report is located in `${HOME}/arduino-ci-script_report`. Note that Travis CI runs each build of the job in a separate virtual machine so if you have multiple jobs you will have multiple reports. The only way I have found to generate a single report for all tests is to run them as a single job. This means not setting multiple matrix environment variables in the `env` array. See https://docs.travis-ci.com/user/environment-variables. The report consists of:
 - Build timestamp
 - Build - The Travis CI build number.
 - Job - Travis CI job number