v1.1.4: Changing the colour of the attachment icon

The original attachment icon was too dark and it was not visible on the background of the pop_os theme

v1.1.3: Merge pull request #3 from tothpsk/1.1.3

• correcting colours in preferences, so they better match the theme colours

v1.1.2: Merge pull request #2 from tothpsk/1.1.2

• edited a colour of the activity icon (without accent), so it better corresponds with the UI

1.1.1

• corrected the colour of the links inside the mail body after applying the prefilter to the email body