v0.13.1 - FIX: Proxy issue

• Fixes issue that would not let the plugin work fine on proxy environments

0f5420e8d0de6cf223df75205888f8b4ceb4e1d8ee81609282b148c9f64b7b73  venafi-pki-backend_v0.13.1_darwin.zip
e1e9d6ae90b6991eb62bb0032012b65d4731516b2b7bef839a16437da411d2fb  venafi-pki-backend_v0.13.1_linux.zip
55d8f2aa1041f954dc756faff8275490bd679ef5de96f2c8f6f499526e36b39d  venafi-pki-backend_v0.13.1_linux86.zip
efdf174b0f4dba5aca03b86109c143db7296c74a239ee7b3814d77f56cb43fb1  venafi-pki-backend_v0.13.1_windows.zip
b8b3713391874847efdd25ed88b529152f469c48f83c9ad217249744ae2b2742  venafi-pki-backend_v0.13.1_windows86.zip