fixed CI

.travis.yml

@@ -1,6 +1,5 @@
 language: python
 python:
-    - "3.7"
     - "3.8"
     - "3.9"
 install:

README.md

@@ -34,46 +34,6 @@ some of its algorithms could be broken using side-channel attacks.
 [![GitHub License](https://img.shields.io/github/license/btclib-org/btclib.svg)](https://github.com/btclib-org/btclib/blob/master/LICENSE)
 [![Follow on Twitter](https://img.shields.io/twitter/follow/btclib?style=social&logo=twitter)](https://twitter.com/intent/follow?screen_name=btclib)
 
-To install (and/or upgrade) btclib and its requirements:
-
-    python -m pip install --upgrade -r requirements.txt
-    python -m pip install --upgrade btclib
-
-You might want to install btclib and its requirements into a
-python virtual environment; e.g. from the root folder:
-
-Bash shell
-
-    python -m venv venv
-    source venv/bin/activate
-    pip install --upgrade -r requirements.txt
-    pip install --upgrade btclib
-
-Windows CMD or PowerShell:
-
-    python -m venv venv
-    .\venv\Scripts\activate
-    pip install --upgrade -r requirements.txt
-    pip install --upgrade btclib
-
-Windows Git bash shell:
-
-    python -m venv venv
-    cd ./venv/Scripts
-    . activate
-    cd ../..
-    pip install --upgrade -r requirements.txt
-    pip install --upgrade btclib
-
-Some development tools are required to develop and test btclib;
-they can be installed with:
-
-    python -m pip install --upgrade -r requirements-dev.txt
-
-Developers might also consider to install btclib in editable way:
-
-    python -m pip install --upgrade -e ./
-
 * * *
 
 Included features are:
@@ -125,3 +85,45 @@ Included features are:
 - [BIP174](https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki)
   partially signed bitcoin transactions (PSBT):
   PsbtIn, PbstOut, and Psbt data classes
+
+* * *
+
+To install (and/or upgrade) btclib and its requirements:
+
+    python -m pip install --upgrade -r requirements.txt
+    python -m pip install --upgrade btclib
+
+You might want to install btclib and its requirements into a
+python virtual environment; e.g. from the root folder:
+
+Bash shell
+
+    python -m venv venv
+    source venv/bin/activate
+    pip install --upgrade -r requirements.txt
+    pip install --upgrade btclib
+
+Windows CMD or PowerShell:
+
+    python -m venv venv
+    .\venv\Scripts\activate
+    pip install --upgrade -r requirements.txt
+    pip install --upgrade btclib
+
+Windows Git bash shell:
+
+    python -m venv venv
+    cd ./venv/Scripts
+    . activate
+    cd ../..
+    pip install --upgrade -r requirements.txt
+    pip install --upgrade btclib
+
+Some development tools are required to develop and test btclib;
+they can be installed with:
+
+    python -m pip install --upgrade -r requirements-dev.txt
+
+Developers might also consider to install btclib in editable way:
+
+    python -m pip install --upgrade -e ./

setup.py

@@ -35,6 +35,7 @@
     classifiers=[
         "Programming Language :: Python :: 3 :: Only",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Development Status :: 4 - Beta",
         "Intended Audience :: Developers",
         "Intended Audience :: Education",