📝 CHANGELOG.md update for 0.56.0 release

[monkut]

Description

CHANGELOG.md update for next release.

GitHub Issues

• Not recognizing virtaulenv created with pyenv (Not recognizing virtaulenv created with pyenv. #1132)
• Remove six from zappa dependencies (Remove six from zappa dependencies #1164)
• Handle optional space in x-forwarded-for header (Handle optional space in x-forwarded-for header #1127)
• [Migrated] #2077 Fix url decoding for query string ([Migrated] #2077 Fix url decoding for query string #879)
• [Migrated] [async] Check if args/kwargs are JSON Serializable while running locally ([Migrated] [async] Check if args/kwargs are JSON Serializable while running locally #704)
• [Migrated] Add on Docs: event_source from S3 with key_filters ([Migrated] Add on Docs: event_source from S3 with key_filters #446)
• [Migrated] Logs are missing query strings ([Migrated] Logs are missing query strings #410)
• [Migrated] Update BINARY_SUPPORT to use Content-Encoding to identify if data is binary ([Migrated] Update BINARY_SUPPORT to use Content-Encoding to identify if data is binary #908)
• Remove obsolete check for Django version < 1.7 (Remove obsolete check for Django version < 1.7 #1158)
• [Migrated] s3 zip includes files that should be matched by the exclude setting #422
• Allow any Python version if using Docker image for Lambda (Allow any Python version if using Docker image for Lambda #1140)
• Incorrect hosted zone match (Incorrect hosted zone match #1190)
• Issue while trying to install or download zappa without binary file (Issue while trying to install or download zappa without binary file #1199)

[coveralls]

Coverage increased (+0.08%) to 74.554% when pulling 93f5d49 on update/changelog into 5c4de19 on master.

[goya813]

LGTM

[souravjamwal77]

Haven't had the time to look into ech and every change but the one's I reviewed are here. Hence, approving.