New %Q and %q format specifiers accept strict and lazy Text as input
respectively. Otherwise they function identically to the %s specifier.
th-printf can now produce lazy Text as well as String, and the improved
internal representation of format strings should slightly increase performance.
Directly producing Text should now be significantly faster than using the
string formatter and packing the result, especially with Text format arguments.
Dropped support for GHC < 8.
0.6.0 (2018-08-18)
Backported new backpack-based code to pre GHC-8.4 versions.
Rename of public modules
Parser rewrite
th-printf now prints a warning when given an erroneous format string
Several printf behaviors have been updated to comply with spec:
x, u, etc. specifiers now only apply to positive integers
