Use OpenSSL default ciphers
Twisted default TLS options restricts the ciphers list a bit -- "a secure default" https://github.com/twisted/twisted/blob/e38cc25a67747899c6984d6ebaa8d3d134799415/src/twisted/internet/_sslverify.py#L1861 We want to be a bit more permissive with Scrapy (at least as permissive as Scrapy 1.0 was, and which used a default OpenSSL Context) See https://www.openssl.org/docs/manmaster/apps/ciphers.html#CIPHER_STRINGS OpenSSL's 'DEFAULT' seems to be reasonable enough. Fixes #2311
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