Add a change log

CHANGELOG.md

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+# Eclipser Change Log
+
+## v1.0
+
+* Stop polluting '/tmp/' directory and keep the intermediate files internally.
+* Replace command line option '--fixfilepath' into '--filepath'. However, we
+  still accept '--fixfilepath' option silently, for backward compatibility.
+* Optimize QEMU tracer for program instrumentation. Previously, coverage tracer
+  memorized node coverage information in a file, but now we use shared memory to
+  reduce overhead.
+* Make Eclipser strictly comply with the given time limit.
+* Clean up overall codes. Especially, grey-box concolic testing module was
+  extensively refactored.
+* Remove message logging for debugging.
+* Make examples more compact.
+
+## v0.1
+
+First public release of prototype.
+