Bump blockbook version to 0.3.1

Author: martinboehm

configs/environ.json

@@ -1,5 +1,5 @@
 {
-    "version": "0.3.0",
+    "version": "0.3.1",
     "backend_install_path": "/opt/coins/nodes",
     "backend_data_path": "/opt/coins/data",
     "blockbook_install_path": "/opt/coins/blockbook",

docs/api.md

@@ -25,7 +25,7 @@ Socket.io interface is provided at `/socket.io/`. The interface also can be expl
 
 The legacy API is provided as is and will not be further developed.
 
-The legacy API is currently (Blockbook v0.3.0) also accessible without the */v1/* prefix, however in the future versions the version less access will be removed.
+The legacy API is currently (Blockbook v0.3.1) also accessible without the */v1/* prefix, however in the future versions the version less access will be removed.
 
 ## API V2
 
@@ -64,7 +64,7 @@ Response:
   "blockbook": {
     "coin": "Bitcoin",
     "host": "blockbook",
-    "version": "0.3.0",
+    "version": "0.3.1",
     "gitCommit": "3d9ad91",
     "buildTime": "2019-05-17T14:34:00+00:00",
     "syncMode": true,

docs/rocksdb.md

@@ -21,7 +21,7 @@ For Ethereum type coins it is fixed size array of 20 bytes.
 
 **Database structure:**
 
-The database structure described here is of Blockbook version **0.3.0** (internal data format version 5). 
+The database structure described here is of Blockbook version **0.3.1** (internal data format version 5). 
 
 The database structure for **Bitcoin type** and **Ethereum type** coins is slightly different. Column families used for both types:
 - default, height, addresses, transactions, blockTxs