0.5.1

Changes:

• Reverted The email field is now automatically included in the fields for the Spam Filter for easier data verification due to unexpected behavior with the email field (the email is sent anonymized by default, thus it should not appear in the fields payload by default). To include the email field into fields, configure the list of input names using the spamfilter.fields: string[] option. [#37]
• Removed unused iife files from dist directories to reduce package size
• README update