chore: Update dev-tools versions in README.

Also by default point to latest image version in Usage section.

Author: playpauseandstop

README.md

@@ -9,7 +9,7 @@ image.
 ## Usage
 
 ```
-FROM playpauseandstop/docker-python
+FROM playpauseandstop/docker-python:3.0.0b0
 ```
 
 ### Included dev-tools
@@ -19,13 +19,13 @@ FROM playpauseandstop/docker-python
 - [poetry](https://poetry.eustace.io) 1.0.0b4
 - [pre-commit](https://pre-commit.com) 1.20.0
 - [tox](https://tox.readthedocs.io/) 3.14.0
-- [curl](https://curl.haxx.se) 7.52.1
-- [git](https://git-scm.com) 2.11.0
+- [curl](https://curl.haxx.se) 7.64.0
+- [git](https://git-scm.com) 2.20.1
 - [locales](https://packages.debian.org/stretch/locales) &
   [locales-all](https://packages.debian.org/stretch/locales-all)
-- [gcc](https://gcc.gnu.org) 6.3.0
-- [make](https://www.gnu.org/software/make) 4.1
-- [nano](https://www.nano-editor.org) 2.7.4
+- [gcc](https://gcc.gnu.org) 8.3.0
+- [make](https://www.gnu.org/software/make) 4.2.1
+- [nano](https://www.nano-editor.org) 3.2
 - [openssh-client](https://packages.debian.org/stretch/openssh-client)
 
 ### Python versions
@@ -35,39 +35,39 @@ other versions supported as well.
 
 List of supported Python versions are (`<PY_VERSION>` -> base Docker image):
 
-#### 3.0.0
+#### 3.0.0b0
 
 - `py38` -> `python:3.8.0-slim-buster`
 
 #### 2.0.0
 
-- `py35` -> `python:3.5.7-slim-stretch`
-- `py36` -> `python:3.6.9-slim-stretch`
 - `py37` -> `python:3.7.5-slim-stretch`
+- `py36` -> `python:3.6.9-slim-stretch`
+- `py35` -> `python:3.5.7-slim-stretch`
 
 #### 1.1.x & 1.2.x
 
-- `py35` -> `python:3.5.7-slim-stretch`
-- `py36` -> `python:3.6.9-slim-stretch`
 - `py37` -> `python:3.7.4-slim-stretch`
+- `py36` -> `python:3.6.9-slim-stretch`
+- `py35` -> `python:3.5.7-slim-stretch`
 
 #### 1.0.3
 
-- `py35` -> `python:3.5.7-slim-stretch`
-- `py36` -> `python:3.6.8-slim-stretch`
 - `py37` -> `python:3.7.3-slim-stretch`
+- `py36` -> `python:3.6.8-slim-stretch`
+- `py35` -> `python:3.5.7-slim-stretch`
 
 To use custom Python version, use tags in your Dockerfile as:
 
 ```
 FROM playpauseansdtop/docker-python:<VERSION>-<PY_VERSION>
 ```
 
-For example, to use `1.0.3` version of `docker-python` with Python 3.6 base
+For example, to use `3.0.0b0` version of `docker-python` with Python 3.7 base
 image:
 
 ```
-FROM playpauseandstop/docker-python:1.0.3-py36
+FROM playpauseandstop/docker-python:3.0.0b0-py37
 ```
 
 [List of all available tags](https://hub.docker.com/r/playpauseandstop/docker-python/tags)
@@ -80,13 +80,13 @@ To build an image:
 make
 ```
 
-To run something, using given image:
+To run something, using built image:
 
 ```bash
 make CMD="..." run
 ```
 
-To push image (or specific version):
+To push image (of specific version):
 
 ```bash
 make VERSION="..." deploy