Commits on Aug 27, 2021

1. Fix ReferenceError …

   When OTEL_TRACES_SAMPLER is used without OTEL_TRACES_SAMPLER_ARG there would be a ReferenceError due to getSamplerProbabilityFromEnv being called above the definition of DEFAULT_RATIO.
   
   ```
   ReferenceError: Cannot access 'DEFAULT_RATIO' before initialization
       at null.getSamplerProbabilityFromEnv (/app/node_modules/@opentelemetry/tracing/src/config.ts:91:58)
       at null.buildSamplerFromEnv (/app/node_modules/@opentelemetry/tracing/src/config.ts:71:44)
       at Object.<anonymous> (/app/node_modules/@opentelemetry/tracing/src/config.ts:38:12)
       at Module._compile (internal/modules/cjs/loader.js:1085:14)
       at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
       at Module.load (internal/modules/cjs/loader.js:950:32)
       at Function.Module._load (internal/modules/cjs/loader.js:784:16)
       at Module.require (internal/modules/cjs/loader.js:974:19)
       at require (internal/modules/cjs/helpers.js:92:18)
       at Object.<anonymous> (/app/node_modules/@opentelemetry/tracing/src/utility.ts:17:1)```

   

   hermanbanken committed Aug 27, 2021
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