Added market hours and indices (#110)

* Added market hours and indices

src/main/kotlin/io/polygon/kotlin/sdk/rest/reference/MarketStatus.kt

@@ -2,6 +2,7 @@ package io.polygon.kotlin.sdk.rest.reference
 
 import io.ktor.http.*
 import io.polygon.kotlin.sdk.rest.PolygonRestOption
+import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
 /** See [PolygonReferenceClient.getMarketStatusBlocking] */
@@ -15,7 +16,10 @@ suspend fun PolygonReferenceClient.getMarketStatus(vararg opts: PolygonRestOptio
 data class MarketStatusDTO(
     val market: String? = null,
     val serverTime: String? = null,
+    val afterHours: Boolean = false,
+    val earlyHours: Boolean = false,
     val exchanges: ExchangesStatusDTO = ExchangesStatusDTO(),
+    val indicesGroups: IndicesGroupsStatusDTO = IndicesGroupsStatusDTO(),
     val currencies: CurrenciesStatusDTO = CurrenciesStatusDTO()
 )
 
@@ -26,8 +30,21 @@ data class ExchangesStatusDTO(
     val otc: String? = null
 )
 
+@Serializable
+data class IndicesGroupsStatusDTO(
+    @SerialName("s_and_p") val sAndP: String? = null,
+    @SerialName("societe_generale") val societeGenerale: String? = null,
+    val msci: String? = null,
+    @SerialName("ftse_russell") val ftseRussell: String? = null,
+    val mstar: String? = null,
+    val mstarc: String? = null,
+    val cccy: String? = null,
+    val nasdaq: String? = null,
+    @SerialName("dow_jones") val dowJones: String? = null
+)
+
 @Serializable
 data class CurrenciesStatusDTO(
     val fx: String? = null,
     val crypto: String? = null
-)
+)