fixed: non-ASCII char in request header

[kutear]

Historically, HTTP has allowed field content with text in the
ISO-8859-1 charset [ISO-8859-1], supporting other charsets only
through use of [RFC2047] encoding. In practice, most HTTP header
field values use only a subset of the US-ASCII charset [USASCII].
Newly defined header fields SHOULD limit their field values to
US-ASCII octets. A recipient SHOULD treat other octets in field
content (obs-text) as opaque data.

But appName may be contain non-ASCII char. so replace with package

ref: appwrite/sdk-for-flutter#25

[lohanidamodar]

Seems logical. Thank you for your PR

[lohanidamodar]

@kutear can you please sync with latest master so that we can see the tests passing. Thank you 🙏🏻

[kutear]

@kutear can you please sync with latest master so that we can see the tests passing. Thank you 🙏🏻

I had merge master and ci was passed.

[eldadfux]

Thanks @kutear !