Bug 1168466 - Bump minimum Mercurial version in bootstrapper; r=me

This should have been done in 4c757e339f81.

DONTBUILD (NPOTB)

--HG--
extra : commitid : 41TCyM9iqVQ
extra : rebase_source : 8defc6b23d507e1580db77869ff2c2e99ee5db5a
extra : amend_source : 5f330ea7c2775675fcc8051e5c46d2439c4e5823

python/mozboot/mozboot/base.py

@@ -74,7 +74,7 @@ We recommend the following tools for installing Python:
 
 
 # Upgrade Mercurial older than this.
-MODERN_MERCURIAL_VERSION = StrictVersion('3.0')
+MODERN_MERCURIAL_VERSION = StrictVersion('3.2.4')
 
 # Upgrade Python older than this.
 MODERN_PYTHON_VERSION = LooseVersion('2.7.3')