Release 1.1.0

* main() can now accept arguments
* the matrix-multiplication operator (@) is now supported
* imports from __future__ are checked for validity
* fixes to doctest scope testing
* asserts against a tuple (which are always true) now emits a warning
* "import *" not at the module level on python3 emits a warning
* many kinds of SyntaxErrors not previously caught now are
* PEP 498 f-strings are checked
* and a few more sundry bugfixes

I'd like to thank this release's contributors:

* Aaron Meurer
* Ian Cordasco
* John Vandenberg
* Nik Nyby
* Steven Myint
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