style: refactor import aliases for easyssh library

- Alias `github.com/appleboy/easyssh-proxy` import as `easyssh` in `main.go`
- Alias `github.com/appleboy/easyssh-proxy` import as `easyssh` in `plugin.go`

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

main.go

@@ -6,7 +6,7 @@ import (
 	"strconv"
 	"time"
 
-	"github.com/appleboy/easyssh-proxy"
+	easyssh "github.com/appleboy/easyssh-proxy"
 	"github.com/joho/godotenv"
 	"github.com/urfave/cli/v2"
 )

plugin.go

@@ -10,7 +10,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/appleboy/easyssh-proxy"
+	easyssh "github.com/appleboy/easyssh-proxy"
 )
 
 var (