PHP notices when posting settings

[fiskhandlarn]

Expected behavior

Save settings without seeing PHP notices

Observed behavior

Notice: options.php was called with an argument that is deprecated since version 2.7.0! The bugsnag_api_key setting is unregistered. Unregistered settings are deprecated. See https://codex.wordpress.org/Settings_API

Notice: options.php was called with an argument that is deprecated since version 2.7.0! The bugsnag_notify_severities setting is unregistered. Unregistered settings are deprecated. See https://codex.wordpress.org/Settings_API

Notice: options.php was called with an argument that is deprecated since version 2.7.0! The bugsnag_filterfields setting is unregistered. Unregistered settings are deprecated. See https://codex.wordpress.org/Settings_API

Steps to reproduce

1. Configure PHP to show notices
2. Go to /wp-admin/options-general.php?page=bugsnag
3. Enter API key
4. Submit the form

Version

1.3.1

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This actually seems to be due to the settings form posting to action="options.php" (as explained in https://wordpress.stackexchange.com/a/289620/144404). If I remove action="options.php" from views/settings.php the form posts without notices.

[fiskhandlarn]

PR to fix this: #37