Add changelog (#127)

CHANGELOG.md

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+
+# Apache OpenWhisk Client Go
+
+## 1.0.0
+  + Handle err return from url.Parse in GetUrlBase (#123)
+  + Add dynamic column sizing to wsk activation list command (#120)
+
+## 0.10.0-incubating
+  + Added extra columns to activation records summary rows (#116)
+  + Replace godep with govendor (#113)
+  + Load X509 cert on client creation (#112)
+  + Add Concurrency to Limits (#94)
+  + Fix invalid warning message (#91)
+  + Allow NewClient to run concurrently (#103)
+  + Update Go Version (#104)
+  + Allow additional headers to override auth header val (#100)
+  + Replace trigger service type with interface (#99)
+
+## 0.9.0-incubating
+  Initial Apache Release