Add news entry for 3.3.3 final.
Issue #15663: Revert OS X installer built-in Tcl/Tk support for 3.3.3.
Some third-party projects, such as matplotlib and PIL/Pillow,
depended on being able to build with Tcl and Tk frameworks in
/Library/Frameworks.  They were unable to build with the built-in
Tcl/Tk and/or execute correctly.
Transplant of rev 544b654d000c: directory traversal attack in CGIHttpRequestHandler.
Issue #19227 / Issue #18747: Remove pthread_atfork() handler to remove OpenSSL re-seeding
It is causing trouble like e.g. hanging processes.
Bump to 3.3.3rc2.
Added tag v3.3.3rc2 for changeset d32442c0e60d
Issue #19586: Update remaining deprecated assertions to their preferred usage.
Correct long line
#17806: Added keyword-argument support for "tabsize" to str/bytes.expandtabs().
Issue #19591: Use specific asserts in ctype tests.
Issue #19591: Use specific asserts in ctype tests.
Issue #19594: Use specific asserts in unittest tests.
Issue #19594: Use specific asserts in unittest tests.
Issue #19600: Use specific asserts in distutils tests.
Issue #19600: Use specific asserts in distutils tests.
Issue #19601: Use specific asserts in sqlite3 tests.
Issue #19601: Use specific asserts in sqlite3 tests.
Issue #19602: Use specific asserts in tkinter tests.
Issue #19602: Use specific asserts in tkinter tests.
Issue #19604: Use specific asserts in array tests.