rm coinbase cert, as httplib cannot use it

data/certs/ca-coinbase.crt

@@ -1,44 +0,0 @@
------BEGIN CERTIFICATE-----
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-+o0bJW1sj6W3YQGx0qMmoRBxna3iw/nDmVG3KwcIzi7mULKn+gpFL6Lw8g==
------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
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-CAUw7C29C79Fv1C5qfPrmAESrciIxpg0X40KPMbp1ZWVbd4=
------END CERTIFICATE-----