Minor bug fixes

This release is the correctly tagged release of 0.1.0 and contains mainly developer side updates of the CI, CD, pre-commits and more.

v0.0.8: Merge pull request #22 from scikit-hep/add-subvariables

Preliminary support for nested variables

Add docs and automatic parsing

Merge pull request #16 from chrisburr/add-docs

Add docs and auto expression type detection

v0.0.6

• Set minimum pyparsing version

v0.0.5: Merge pull request #11 from chrisburr/add-more-constants

• Add support for all TMath constants except those related to uncertainties
• Add support for most TMath functions
• Add variables, named_constants and unnamed_constants properties to Expression objects
• Generally improve Expression API

v0.0.4

• Add support for constants
• Improve add ExpressionComponent base class for expressions
• Add support for combining expressions using various operators
• Improve logging
• Add support for setting the log level with the FOMULATE_LOG_LEVEL environment variable

v0.0.3

• Add README to PyPI
• Ensure parentheses are always present in string output to avoid losing the order of operations
• Fix Python 2.7 support

v0.0.2

• Fix order of operations
• Add additional operations
• Allow converting back to a string using the to_root and to_numexpr methods
• Add support Python 2.7, 3.4 and 3.5

Initial version

v0.0.1

Deploy to PyPI from travis