Add BH renewable Capacity (electricitymaps#2516)

* Add BH renewable Capacity

* Update README.md

* Update zones.json

Co-authored-by: martincollignon <2604526+martincollignon@users.noreply.github.com>

README.md

@@ -211,6 +211,7 @@ Production capacities are centralized in the [zones.json](https://github.com/tmr
 - Austria
   - Wind: [IGWindKraft](https://www.igwindkraft.at)
   - Other: [ENTSO-E](https://transparency.entsoe.eu/generation/r2/installedGenerationCapacityAggregation/show)
+- Bahrain: [IRENA](https://www.irena.org/-/media/Files/IRENA/Agency/Publication/2020/Mar/IRENA_RE_Capacity_Statistics_2020.pdf)
 - Belarus: [belstat.gov.by](http://www.belstat.gov.by/upload/iblock/7f7/7f70938f51eb9e49abc4a6e62f831a2c.rar), [RenEn](http://director.by/zhurnal/arkhiv-zhurnala/arkhiv-nomerov-2017/375-7-2017-iyul-2017/5456-zelenaya-energetika-nabiraet-oboroty)
 - Belgium
   - Hydro, Oil: [ENTSO-E](https://transparency.entsoe.eu/generation/r2/installedGenerationCapacityAggregation/show)

config/zones.json

@@ -527,8 +527,13 @@
   },
   "BH": {
     "contributors": [
-      "https://github.com/q--"
+      "https://github.com/q--",
+      "https://github.com/nessie2013"
     ],
+    "capacity": {
+      "solar": 6,
+      "wind": 1
+    },
     "parsers": {
       "consumption": "GCCIA.fetch_consumption"
     },