Fix misspelling and add Mesos change

Author: velvia

notes/0.6.2.markdown

@@ -19,6 +19,6 @@
 * Database migration scripts and better table definitions (@v-gerasimov)
 * Chinese doc updates (@zp-j, @liujuncheng)
 * Minor improvements in style (@apivovarov)
-* SBT and other dependency upgades (@hntd187, @jaceklaskowski)
+* SBT and other dependency/plugin upgrades, including to Mesos 0.28 (@hntd187, @jaceklaskowski)
 * README change to document overriding default meta data DB backend (@noorul)
 * README typo fix (@qayshp)