Metrics Div and Earnings Added

Added Dividends and Earnings Metrics.
Fixed MarketMetric function.

metrics.go

@@ -6,6 +6,30 @@ import (
 	"net/url"
 )
 
+type DividendInfo struct {
+	OccuredDate	string  `json:"occurred-date"`
+	Amount		float32 `json:"amount"`
+}
+
+type MarketMetricDividendResponse struct {
+	Data struct {
+		Items []DividendInfo `json:"items"`
+	}
+	Context string `json:"context"`
+}
+
+type EarningsInfo struct {
+	OccuredDate	string `json:"occurred-date"`
+	EPS		float32 `json:"eps"`
+}
+
+type MarketMetricEarningResponse struct {
+	Data struct {
+		Items []EarningsInfo `json:"items"`
+	}
+	Context string `json:"context"`
+}
+
 type MarketMetricInfo struct {
 	Symbol                           string   `json:"symbol"`
 	ImpliedVolatilityIndex           float32   `json:"implied-volatility-index"`
@@ -23,22 +47,29 @@ type MarketMetricInfo struct {
 	} `json:"option-expiration-implied-volatilities"`
 }
 
-func (api *TastytradeAPI) GetMarketMetricInfo(symbol string) (MarketMetricInfo, error) {
+type MarketMetricResponse struct {
+	Data struct {
+		Items []MarketMetricInfo `json:"items"`
+	}
+	Context string `json:"context"`
+}
+
+func (api *TastytradeAPI) GetMarketMetricInfo(symbol string) (MarketMetricResponse, error) {
 	urlVal := fmt.Sprintf("%s/market-metrics/%s", api.host, url.PathEscape(symbol))
 	data, err := api.fetchData(urlVal)
 	if err != nil {
-		return MarketMetricInfo{}, err
+		return MarketMetricResponse{}, err
 	}
 
-	var response MarketMetricInfo
+	var response MarketMetricResponse
 	jsonData, err := json.Marshal(data)
 	if err != nil {
-		return MarketMetricInfo{}, err
+		return MarketMetricResponse{}, err
 	}
 
 	err = json.Unmarshal(jsonData, &response)
 	if err != nil {
-		return MarketMetricInfo{}, err
+		return MarketMetricResponse{}, err
 	}
 
 	return response, nil