Remove old packages, update readme

Dockerfile

@@ -3,9 +3,7 @@
 #
 FROM alpine:3.8
 LABEL maintainer "jar3b <hellotan@live.ru>"
-RUN apk add --no-cache alpine-sdk libressl-dev mariadb-dev postgresql-dev gdbm-dev readline-dev bash libtool autoconf \
-    automake perl-dev python2-dev openldap-dev krb5-dev unixodbc-dev linux-pam-dev sqlite-dev talloc-dev libpcap-dev \
-    linux-headers curl-dev hiredis-dev json-c-dev sudo
+RUN apk add --no-cache alpine-sdk bash libtool autoconf automake linux-headers sudo git
 RUN adduser -D builder \
     && passwd -d builder \
     && echo "builder ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers \

README.md

@@ -58,4 +58,5 @@ build:
 - 3.5
 - 3.6
 - 3.7
-- 3.8 (latest)
+- **3.8**
+- 3.9 (latest)