Support command line text & new API attributes (#8)

* support `style` and `use_speaker_boost` API attrs

* support optional command line string as text

* print out time it took to run

client/types/types.go

@@ -31,11 +31,19 @@ func (so *SynthesisOptions) Clamp() {
 	if so.SimilarityBoost > 1 || so.SimilarityBoost < 0 {
 		so.SimilarityBoost = 0.75
 	}
+	if so.Style > 1 || so.Style < 0 {
+		so.Style = 0.0
+	}
+	if so.UseSpeakerBoost != true && so.UseSpeakerBoost != false {
+		so.UseSpeakerBoost = true
+	}
 }
 
 type SynthesisOptions struct {
 	Stability       float64 `json:"stability"`
 	SimilarityBoost float64 `json:"similarity_boost"`
+	Style           float64 `json:"style"`
+	UseSpeakerBoost bool    `json:"use_speaker_boost"`
 }
 
 type SharingOptions struct {