Added partial release notes for 1.9.3 and 3.0.0 [docs]

docs/releases/1.9.3.md

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+# Version 1.9
+17 February 2014
+
+## Changes:
+
+- (feature) the #fuelReplacement selector offers the ability to statically replace an object (e.g. with nil) during analysis. This can lead to significantly smaller graphs and improved speed when serializing large graphs
+- (feature) serialize the same graph that was analyzed instead of retrazing the graph during serialization. This prevents changes in the graph from happening between analysis and serialization
+- (change) store source when serializing CompiledMethod objects. Needed because Opal does not allow decompilation
+- (fix) migrate variables across hierarchy
+- (feature) Object>>serializeToFileNamed: shortcut for serializing arbitrary objects
+- (fix) better compression for LargeNegativeIntegers (https://pharo.fogbugz.com/f/cases/12052/Fuel-could-store-LargeNegativeInteger-up-to-32bits-magnitude)

docs/releases/3.0.0.md

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+# Version 3.0.0
+19 February 2018
+
+## Announcement
+Version 3.0.0 is essentially versino 2.2.0. However, the sources are now on Github and we've done some work on repackaging.
+
+Use Metacello to install from baselin by following the instructions at https://github.com/theseion/Fuel.