Upgrade to ElectrumX 1.8.7 (#10)

* Update to version 1.8.7 of ElectrumX

* Upgrade to Python 3.7

This is suggested in the release notes of ElectrumX:

"It is strongly recommended you upgrade to Python 3.7, which
fixes bugs in asyncio that caused an ever-growing open file count
and memory consumption whilst serving clients.  Those problems
should not occur with Python 3.7."

* Remove .py from the file to execute

* Rename Bitcoin to BitcoinSegwit as required by ElectrumX

* Travis to check version from new path

.travis.yml

@@ -1,7 +1,7 @@
 sudo: required
 services:
   - docker
-script: docker build -t electrumx . && ( docker run electrumx cat /electrumx/server/version.py | tee /dev/stderr | grep -q "'ElectrumX $(cat VERSION)'" ) 2>&1
+script: docker build -t electrumx . && ( docker run electrumx cat /electrumx/electrumx/__init__.py | tee /dev/stderr | grep -q "'ElectrumX $(cat VERSION)'" ) 2>&1
 notifications:
   email:
     on_success: never

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.6-alpine3.6
+FROM python:3.7-alpine3.7
 LABEL maintainer="Luke Childs <lukechilds123@gmail.com>"
 
 COPY ./bin /usr/local/bin

README.md

@@ -15,7 +15,7 @@ An easily configurable Docker image for running an Electrum server.
 docker run \
   -v /home/username/electrumx:/data \
   -e DAEMON_URL=http://user:pass@host:port \
-  -e COIN=Bitcoin \
+  -e COIN=BitcoinSegwit \
   -p 50002:50002 \
   lukechilds/electrumx
 ```

VERSION

@@ -1 +1 @@
-1.4
+1.8.7

bin/init

@@ -4,4 +4,4 @@ if [ ! -e "${SSL_CERTFILE}" ] || [ ! -e "${SSL_KEYFILE}" ]; then
   openssl req -newkey rsa:2048 -sha256 -nodes -x509 -days 365 -subj "/O=ElectrumX" -keyout "${SSL_KEYFILE}" -out "${SSL_CERTFILE}"
 fi
 
-exec /electrumx/electrumx_server.py
+exec /electrumx/electrumx_server