bump version to 0.3.0

Author: mehrdadrad

Makefile

@@ -1,6 +1,6 @@
 PACKAGES=$(shell find . -name '*.go' -print0 | xargs -0 -n1 dirname | sort --unique)
 GOFILES= vflow.go ipfix.go sflow.go options.go stats.go 
-LDFLAGS= -ldflags "-X main.version=0.2.1"
+LDFLAGS= -ldflags "-X main.version=0.3.0"
 
 default: test