Moving back to Pipenv to manage dependencies

Poetry breaks no-binary installations of the RSA library, which defeats
the purpose of this library.

See https://github.com/sybrenstuvel/python-rsa/issues/148

Among other changes, this reverts commit
fcf5b7457c70426a242b17db20dd4e34e1055f69.

I also added a workaround for an `ImportError` importing `zipp` on
Python 3.5.

1 files changed, 0 insertions, 1008 deletions

diff --git a/poetry.lock b/poetry.lock
deleted file mode 100644
index 173c007..0000000
--- a/poetry.lock
+++ /dev/null
@@ -1,1008 +0,0 @@
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