verbose download error logging

Author: ianfixes

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - SPI mocks
 - `ensure_arduino_installation.rb` to allow custom libraries to be installed
 - Copy constructor for `ArduinoCITable`
+- Some error information on failures to download the Arduino binary
 
 ### Changed
 - Refactored documentation

lib/arduino_ci/arduino_downloader.rb

@@ -132,6 +132,8 @@ def download
       open(package_url, ssl_verify_mode: 0, progress_proc: dot_printer) do |url|
         File.open(package_file, 'wb') { |file| file.write(url.read) }
       end
+    rescue Net::OpenTimeout, Net::ReadTimeout => e
+      puts "\nArduino force-install failed downloading #{package_url}: #{e}"
     end
 
     # Extract the package_file to extracted_file