add Goblin race

This commit adds Goblin race and it's features.
Source: Guildmaster's Guide to Ravnica

dungeonsheets/features/races.py

@@ -316,6 +316,26 @@ class StoneCamouflage(Feature):
     source = "Race (Deep Gnome)"
 
 
+# Goblins
+class FuryOfTheSmall(Feature):
+    """
+    When you damage a creature with an attack or a spell and the creature's
+    size is larger than yours, you can cause the attack or spell to deal extra
+    damage to the creature. The extra damage equals your level. Once you use
+    this trait, you can't use it again until you finish a short or long rest.
+    """
+    name = "Fury of the Small"
+    source = "Race (Goblin)"
+
+
+class NimbleEscape(Feature):
+    """
+    You can take the Disengage or Hide action as a bonus action on each of your
+    turns.
+    """
+    name = "Nimble Escape"
+    source "Race (Goblin)"
+
 # Half-Elves
 
 # Half-Orcs

dungeonsheets/race.py

@@ -415,6 +415,16 @@ class WaterGenasi(_Genasi):
                 feats.CallToTheWave)
 
 
+class Goblin(Race):
+    name = "Goblin"
+    size = "small"
+    dexterity_bonus = 2
+    constitution_bonus = 1
+    speed = 30
+    languages = ("Common", "Goblin")
+    features = (feats.Darkvision, feats.FuryOfTheSmall, feats.NimbleEscape)
+
+
 PHB_races = [HillDwarf, MountainDwarf, HighElf, WoodElf, DarkElf,
              LightfootHalfling, StoutHalfling, Human, Dragonborn,
              ForestGnome, RockGnome, HalfElf, HalfOrc, Tiefling]
@@ -425,7 +435,10 @@ VOLO_races = [ProtectorAasimar, ScourgeAasimar, FallenAasimar,
 EE_races = [Aarakocra, DeepGnome, AirGenasi, FireGenasi, EarthGenasi,
             WaterGenasi]
 
-available_races = PHB_races + VOLO_races + EE_races
+#Guildmaster's Guide to Ravnica
+GGTR_races = [Goblin]
+
+available_races = PHB_races + VOLO_races + EE_races + GGTR_races
 
 __all__ = tuple([r.name for r in available_races]) + (
-    'available_races', 'PHB_races', 'VOLO_races', 'EE_races')
+    'available_races', 'PHB_races', 'VOLO_races', 'EE_races', 'GGTR_races')