update dependencies + use focal dist for travis

Author: doersf

.travis.yml

@@ -1,11 +1,11 @@
 language: python
-os: linux
+dist: focal
 python:
   - 3.6
   - 3.7
   - 3.8
   - 3.9
-  - "3.10-dev"
+  - 3.10
 
 install:
   - pip3 install .

setup.cfg

@@ -4,7 +4,7 @@
     long_description = fh.read()
 
 setup(name='block-io',
-      version='2.0.5',
+      version='2.0.6',
       description='The easiest way to integrate Bitcoin, Dogecoin and Litecoin in your applications. Sign up at Block.io for your API key.',
       url='https://github.com/BlockIo/block_io-python',
       author='Atif Nazir',
@@ -15,9 +15,9 @@
       long_description=long_description,
       long_description_content_type="text/markdown",
       install_requires=[
-          'requests>=2.25.0',
+          'requests>=2.25.0,<3.0',
           'pycryptodome>=3.9.9,<4.0',
-          'base58==2.1.0',
-          'bitcoin-utils-fork-minimal==0.4.11.4'
+          'base58>=2.1,<2.2',
+          'bitcoin-utils-fork-minimal==0.4.11.6'
       ],
       zip_safe=False)