"make update" fails if package has "-" in it

version.go:
````
package runner-ex

// Version of runner
const Version = "0.0.1"

````

bash:
````
x-MacBook-Pro:runner-ex apple$ make update
go get -u -tags "sqlite"
# github.com/joeblew99/runner-ex
./version.go:1:15: syntax error: unexpected -, expecting semicolon or newline
make[1]: *** [update] Error 2
````
 


