FIX: Documentation for for 0.14.1 change log

Missing code reference in change log documentation
CI: fix typos in readme
BUG: ewma() weights incorrect when some values are missing (GH7543)
Merge pull request #7831 from nathantypanski/typo-correction

CI: fix typos in readme
TST/BUG: html tests not skipping properly if lxml is not installed
BUG: forgot to super the right class
BUG: offsets.apply doesnt preserve nanosecond
Merge pull request #7836 from cpcloud/read-html-test-fix

TST/BUG: html tests not skipping properly if lxml is not installed
COMPAT/TST: add assertRaises and assertRaisesRegex to the base TestCase to avoid confusion
BUG: _flex_binary_moment() doesn't preserve column order or handle non-unique columns
Merge pull request #7738 from seth-p/flex_binary_moment_column_order

BUG: _flex_binary_moment() doesn't preserve column order or handle multiple columns with the same label
Merge pull request #7697 from sinhrks/offsetnano

BUG/PERF: offsets.apply doesnt preserve nanosecond
BUG: DTI.value_counts doesnt preserve tz
Merge pull request #7735 from sinhrks/value_counts_tz

BUG: DTI.value_counts doesnt preserve tz
BUG: Series.__iter__ not dealing with category type well (GH7839)
Merge pull request #7842 from jreback/cat_iter

BUG: Series.__iter__ not dealing with category type well (GH7839)
BUG: PeriodIndex.unique results in Int64Index
DOC: add link to SettingWithCopy warning/error message (GH7658)
COMPAT: SettingWithCopy will now warn when slices which can generate views
        are then set
Merge pull request #7845 from jreback/setting_with_copy

COMPAT: SettingWithCopy will now warn when slices which can generate views are then set