chore(main): release 1.5.0

:robot: I have created a release beep boop

add argument completion for :ConvertSnippets command (2ba844f)
add keybinding to send parsing + conversion errors to the quickfix list (078ab15)
add mapping to send all input files to the quickfix list (612fbdc)
add option to disable generating package.json file (9d34713)
add separate format for LuaSnip VSCode snippets (e.g. autotrigger is now respected); refactor parse methods (d54f1aa)
add support for Emac's YASnippet (bdee9d1)
default_opts to override command options (95d2c46)
snipmate_luasnip: support Vimscript code (#9) (2f3a53c)
snipmate: add snipmate_luasnip flavor (a09be99)
snipmate: parse snippet priorities (this extended syntax is supported by LuaSnip) (f20e843)
ui: <C-o> to send output files to quickfix list (d324617)
ultisnips: detect and remove unnecessary regex option in snippets (0f4c3b3)
vscode_luasnip/ultisnips: convert snippet priorities (f4b0679)
vscode_luasnip: don't convert variables to Vimscript (1abbc97)
vscode: support if / else texts in format node (2922aab)

add nil check when checking type of luasnip key (f9f84d2)
compatibility with LuaJIT (and Lua 5.1) (264fb7c)
export snippets for current filetype only (ec3c73d)
json_utils: correctly sort table by keys (4d23af7)
snipmate: add tests; fix(parser): parse escaped } correctly (5b235b6)
snipmate: replace newline characters with whitespace in snippet description (ccff794)
ultisnips: convert + error out on invalid choice nodes; only support directory as output path (9349bfa)
ultisnips: correctly parse snippets with empty body or single empty line (193ee47)
ultisnips: ensure description is present if snippet options are set (c47dc28)
ultisnips: parse literal "endsnippet" in snippet definition (f4ed0e4)
vscode_luasnip: parse input snippets correctly; unify luasnip.autotrigger and autotrigger fields (c3b815a)
vscode: add a name to snippets returned from transformation function (48842b6)
vscode: convert visual placeholder to TM_SELECTED_TEXT variable (29e7457)
vscode: correctly handle UltiSnips extends directives when generating package.json file (28f7153)
VSCode: disallow parsing 0 tabstop in choice node, convert choice node (4b07896)
vscode: do not try to convert snippets in package.json (785648b)
vscode: exclude package snippets in package.json to avoid LuaSnip error (aa48221)
vsnip: escape $ in text nodes during conversion (de0bc85)

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